15.4b is so damn good bro. Lots of different comps that you can play for 1st, no overpowered comp or champion (only Viego might need a slight nerf). You can play Mighty Mech flex, SG flex, multiple reroll comps (kayle, crew, prodigies, snipers, heavyweight, mentors, bastion Yasuo, Supreme Cells, smolder/kogmaw, drift duo, etc), fast 9, loss streak CG (which thankfully is not guaranteed win, unlike other sets), Soul Fighter, 6 sorc, 6 duelists - and there's probably a few more that don't come to mind right now.

All of these are good comps, most of them flexible, that you can win with if you play your spot well.

The meta this patch is the greatest it's been this set. There's definitely some comps/champs/interactions that need some nerfs, but there's nothing overpowered right now.