Some folks seem to be forgetting a basic and very important component on ANY airplane, at least in my opinion: GOOD, FUNCTIONAL shoulder harnesses. I parked a 185 on a mountainside after a crankshaft failed, which ended up not pretty at all for the airplane. I came out of that accident without even strap rash, largely due to the presence and use of BAS shoulder harnesses. Take a look at the BAS web site for a few photos of airplanes whose pilots owe their lives to BAS harness systems, including mine.
If you don't have a GREAT harness system, no modification to the flap actuator is going to save your life in a bad accident. Period. Having to slip a shoulder harness off to do ANYthing on takeoff or landing suggests to me an inadequate and frankly dangerous harness system, and THAT is where I'd start off by spending my money FIRST. Been there, done that. BAS harness went into MY airplane the week after the aforementioned 185 accident. See BAS testimonial page at:
http://www.basinc-aeromod.com/As to electric flaps vs manual, I don't have a dog in that fight. I've flown most of the small airplane flap arrangements, and frankly, I don't much care what type I'm using--it's simply a matter of learning to use what the airplane has. I have a few thousand hours in each flavor of Cessna, Piper, Aviat and aircraft with hydraulically actuated flaps. Much of that was off airport and/or back country type operation. I was handed the keys to a refurbished Cessna 206 some time after the 185 accident, because a "committee" selected that as a replacement airplane for the 185. After something over 4 or 5 thousand hours in 180/185 airplanes, I really didn't want to switch to the 206, one reason being the electric flaps. I had one vote on the committee, and the group chose the 206. Nevertheless, the 206 turned out to be a GREAT backcountry airplane in almost every conceivable way. Frankly, with few exceptions, I'd MUCH rather work a 206 (note the operative term "work" here) than I would a 185, PARTICULARLY in the back country. Want to dump flaps on landing? In the 206, initiate the flare, and reach over and flip that little switch to the "up" position. Touch, stand on the brakes. Finis. Even I can look pretty good landing short in a 206.
Take a look at what Cessna airplanes are working the back country on a daily basis....most are 206/207 as opposed to 185s. Why would that be? Tthe cargo door is a big seller, but if the plane wouldn't perform, the operator could do without the big door. I can show you operators in AK who routinely go in and out of serious backcountry landing sites with 206 airplanes, operators who USED to work 185s, yet they seem to go the same places for the most part that the 185s did.
I currently own a Cessna 170, and I almost never dump flaps on landing. If I feel that I would have to do so to make a landing work out, I go somewhere else. I am NOT working the airplane. I also rarely dumped flaps in the 180/185 airplanes, even when working, until the airplane was down and straight. The 180/185 airplanes can get sorta busy on the ground at speed, so maybe the EZFlap gizmo would be a good deal if you really NEED to dump flaps on landing. But even with an EZFlap gizmo, you are going to have to find the lever, and move some body parts to make it work, including that all important right hand coming off the throttle. All that involves a distraction from job one in these airplanes, which is keep it in the tracks. With an early 172/182, the slight distraction of dumping the flaps is really no big deal, with the docile handling of these airplanes. I never found it that distracting to dump flaps in a Super Cub or Husky on landing, but again, those are pretty gentle airplanes. And, again, it's a rare instance where you really HAVE to dump flaps.
I agree that $500 isn't much money in aviation these days. Heck, our government seems to think that if you add enough trillions onto the deficit you'll be talking some real money....But consider this: $500 would buy 125 gallons of avgas at $4.00 per gallon. In an airplane that burns say 10 gph in the pattern (and that's a lot) , that would provide roughly 12 HOURS of landing/takeoff practice. Okay, so go find an instructor who really knows how to fly your type airplane in the back country, and hire him/her for a couple hours, and make it 2 hours of dual and 5 or 6 hours of practice, some of it in real backcountry landing zones.
I would argue that this might be a better investment of $500 dollars. In looking at the numbers of hours many privately owned aircraft are flown in a year, I firmly believe this approach would SERIOUSLY improve safety for many of us. The single best thing you can do for your safety in flying the back country is to FLY the plane, learn to fly it WELL, and fly it regularly.
To me, that's the better investment, but it's your money. I'll stick with what I've got, and focus on keeping it straight after touchdown.
But, whatever you do, if you don't have a GREAT shoulder harness installed in your airplane--do not hesitate, put a GREAT shoulder harness system on your list of MUST-HAVE safety equipment. Again, take a look at
http://www.basinc-aeromod.com/ for some examples of why. I don't work for BAS, nor do I have any stake in their business. Their harnesses are not cheap, either. How much is your face worth?
MTV