My experience with the Solo is very limited, but might be helpful. I just picked on up this past week, and ran a 50 rd box of 147 grain FMJ through it. Not a single FTF or FTE. My take on some of the common complaints:
1) Too "snappy" or too much kick:
I really don't get this one. I sit at a desk 8hrs/day for the last 30 years, doing nothing but developing software. I found the recoil not worth even mentioning.
2) Too many FTF problems:
Again, not a single one for me. Two thoughts on this. First use the recommended grain (124-147), and even at that I would use the higher end for the first couple hundred rounds. The springs are very tight and can use the extra recoil to fully cycle the gun. Also, I suspect that, due to the smallness of the gun, some may not have found the proper grip and are unknowingly limp wristing it, causing failure to fully cycle. Just guesses, but may account for some of the complaints.
3) Magazine falls out:
Happened only once to me, and then I learned to really smack it in hard. After that, not a problem. Again, everything is really tight on this at first. Don't baby it just because it's small.
4) Magazine is too hard to load:
True. For the first few magazine loads, I resorted to just putting in 3 or 4 rounds. By the end of the box, I was able to fully load the magazine. Not sure if it loosened up or I got more adept at it. Nevertheless, ordered an Uplula for easier and faster loading in the future. Along these lines, I ordered 4 extended magazines (8 rd capacity) just for a little nicer shooting range experience. Obviously, won't use them for EDC.
The other thing I don't get is the folks who whine about it only taking a certain specification of ammo. Why? Would you buy a Mercedes and then gripe that it says "Premium Unleaded only"? Give me a break! I never hear a guy with a diesel truck griping that he can only put the more expensive (than unleaded) diesel in it. But, for some reason, you have a certain group of people that think they ought to be able to feed anything into the barrel of a gun and it should work.
For me, the Solo felt perfect in terms of grip, recoil, accuracy, and feel as a concealed carry. Hopefully, I'll still be of the same opinion after a few hundred more rounds.