I went 3-1 with the deck last night (I did use a slightly different version with 2x Manamorphose and some filler cards in SB).
First match 2-0:
Went against U/G infect.
First match was way too slow for both of us (we had to mull to 5), but I managed to get the upper hand by countering his finisher and killing him with a 10/4 double strike unblockable pro blue cyclops.
Second match was a lot more tense with both going fast and using some blue trickery to stop the opponent from killing them. In the end I managed to kill him with his own weapon by getting him to 16 poison counters while being at 9 myself.
Didn't really have to make any sideboard decisions here, the deck worked fine as it was in this matchup.
Second match 2-0:
Went against RDW.
The first one was really close, I was drawing some slow lands so he was really getting to my life points and he used too much burn on my creatures to keep them from dying all the time until I had about 5 lands, where I just saved my creature from his burn and got him from 20 to 0 in one turn.
The second one I don't recall anymore, but it was fairly close again with about the same scenario as the first match.
The only sideboard decision I made was to get another Confounds in (I removed one to get the manamorphose), which helped me out a lot.
Third match 1-2:
Went against Esper Combo.
First one I got to his life points before he could combo and there wasn't a lot going on.
Second one it became clear that almost his entire sideboard was made to stop a deck like mine with Circle of Protection: Reds and Blue Elemental Blasts all over the place. Couldn't really do much until he managed to do his combo and mill me to death.
Third one I boarded in some Negates (which acted as fillers in my SB), but I didn't have the mana to counter his circle of protection before he could drop one. It was really close though, since I managed to get three creatures on, but didn't draw more than one red mana and no manamorphoses, so I couldn't really get past the circle of protection by giving them all double strike (and the unblocked one infect - he only had two creatures and 1 mana).
Fourth match 2-0:
Went against Boros Aggro.
Not much of a challenge here, it was a deck made out of some spare commons he still had left and didn't stand a chance when I insta-killed him. Also didn't need to side anything in.
All in all I'm pretty happy with the deck and might add some enchantment hate to deal with those pesky circles, but I'll see about that later.