I thought this was a great review on youtube btw, and in general he does a really good job with his reviews. Regarding comfort - I'm using the 315 @ a lower spec swingweight (293 unstrung), and have had minimal issues with comfort (I'm 50 years old, primarily a singles player, now a 6.5 UTR but coming back to the game after playing DI college tennis back in the day). I've been on a racquet journey this last fall/winter since my pure strike was giving me major shoulder issues after I started playing more than once a week, then spent some time playing the Radical MP and the Extreme Aux MP, both of which I needed to play with a hybrid multi/gut in the mains to avoid arm issues. Since switching to this 315, I've only been playing with poly and I find it to be more comfortable than the other racquets I had been using - some of this is personal preference w/r to weight, style of play, etc.. In college, I played with a rather heavy old version of the pro staff, so this feels like home a bit for me, so maybe that's why it's easier? Also, the reviewer didn't mention the lateral flexibility this racquet provides which isn't measure in the standard 68 RA seen with this racquet.