The Gen 4 grip is very good, much easier to hang on to than the smooth Gen 2. I also like it better than Gen 3 and think most people like it better as well.
In the end though, I put Pachmayer slip on grips on my 23Gen4 and like that even better. Also have them on my 22 Gen 2.
Haven't tried the Talons but they look like skateboard tape, not sure I want it that abrasive.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
US Army 1966-69, VFW Life Member, Retired Geek