I've almost stopped using bittering hops I add all mine at whirlpool, you still get a lot of bitterness. More than you may think
Some of my best IPAs I have made this way. Drinking one now
I've not had any off flavours since going all grain. It could be that i now know more about sanitising and temp control though. I don't think I'd bother with kits again though never had one I was completely happy with
Tesco have an offer on at the moment 20% off if you buy 4 or more craft beer individual bottles not a bad deal, I had some tonight from furepure, thornbridge, stone and a Brooklyn scorcher than were all good