Which Groupset?

If you're not group riding at fast pace, a compact is more than ever enough, and a lot nicer to ride with a close block in back. Compact and 11-25 or 11-27/28 would be perfect.
I want to put one on my all use bike. Far more useful for most people that 53X39. 50x11 is a massive gear. And 34x25 is a very practical gear.

50x11 at 100rpm is 36 mph.

I agree.
50/34 + 11-25 gives 35.7 - 119.5 GI, with a tight cassette.

I fancied trying 52/36
52/36 + 11-25 gives 37.8 - 124.2 GI
I'd get more use out of my little ring (insert friday joke here), and I would have moar fast at the top end.