I'm all about experimental aircraft. However, when it comes to rotorcraft I personally believe there is just too much risk.
#1 reason: Design and engineering. I'm sure that some of these exp. helicopters have great designs, but they have no standard or regulation to uphold to that I'm aware of other than proving that it can fly. With rotorcraft there is 0 margin for design error. Sure they go through there own r&d but real issues may not show up for thousands of flight hours. One scissor link, pitch link, rod end, or gear failure, and that's it. There are ALOT of AD's on certified aircraft as a result of unfortunate incidents. These may not show up for many years. Robinson was certified in 1992 and has a M/R blade AD from 2018. Again, my opinion here, so take it for what it's worth, but I simply believe there is not enough reputation or regulation for these machines for me to feel comfortable flying my friends and family through the mountains in.
Now, when it comes to performance, it really depends on what you want to do with it. If you want a helicopter I assume you want to do helicopter stuff...land on pinnacles, rocks, ridges, etc. Any helicopter can get in and out of a backcountry airstrip. But why get a helicopter if you're going to use runways. A good standard when it comes to performance is to go by the helicopters HOGE chart. (Hover out of ground effect) If the chart says it can do it, and you're comfortable, it's worth a shot. But you will find that if you want to land on a ridge in the mountains, you will need to be by yourself, with low fuel and low temps. The reason I use the HOGE chart for stuff like that is because on some of theses landing spots you may or may not be completely in ground effect. Steep ridges and rocky terrain makes the air do some funny things under a helicopter. Can it be done? Yes. Can it be done safe? Yes. I believe helicopters can be much safer than airplanes. Is it worth it? Yes. Will you have any money left? Depends. Which brings me to the next question. Is it affordable?
A relative question obviously but as stated before, there are alot if costs involved. Robinson publishes their operating costs but take that with a grain of salt. The Cabri also does the same and they are building up quite the reputation with a high level of safety and a number of on condition parts. I have about 100hrs in them and they are definitely a fun little helicopter. But its going to cost you about $375k to get your hands on one. Again, affordable being completely relative to the individual.
Hope this helps, I plan on doing some fun helicopter videos soon. Check out my IG @heli_adams for some pictures and content coming soon that's hopefully fun to watch and educational for all you backcountry crazies on here
