I really like Delver. I like that it is aggressive, plays blue cards, Pyroblast, Null Rod and Wasteland.
I considered playing it at Champs but decided to go with Survival instead because I was wary of playing a fair deck in a large tournament (and Survival is the new hotness, etc) but I had a decent amount of success (in the small sample size that I was able to play) with both URg and URw online. I was especially liking URg:
I went 33-7 with a few different versions of URg Delver in August and September of this past year. Some leagues, a lot of tournament practice matches. I especially beat up on DPS and Outcome but I didn't play Shops much and didn't trust that matchup because of that.