As he said, U360's are analog. If you aren't really worried about having perfect support for analog games, keep your 49's. Two gpwiz49's will run you $40 while two U360's will run you $120. Software wise, they operate very similarly, switching with software to 8,4,2,49, or whatever game you are playing.
I have two 49's, they feel great. Got them on ebay out of an old blitz cab.