My brother and my friend both got this gun recently, so I played a few rounds with each of their guns.
With the stock barrel the accuracy isn't anything to write home about, but it also wasn't a total let down. Definately get a barrel for this when you can. On the subject of barrels, the shroud makes it so some barrels will not meet the breech at all. My sly barrel has Impulse/Ion threads and the jewel on the base of the barrel makes it impossible to mount. My Evil Pipe also wouldnt fit (not that it matters since it's Spyder threads, just wanted to see if it would fit). So make sure you get barrels you know will fit down there.
The stock board is pretty lame. The gun's capped at 11 BPS with three firing modes, it has no eyes, and the tournament lock is absurd. If you have no interest in playing tournaments with this thing, the stock board does plenty. If you're toying with speedball, the blackheart board would be a good idea.
The dissassembly is very simple. Ion users know how much of a pain it is to clean an Ion, with the SP1 there's a few easily accessible screws, and a back cap... Pretty easy.
Also on the downside, I think the gun looks goofy. The feedneck, while it certainly does its job, could use some improvement. Furthermore, my brother's trigger has gotten jammed in the firing position at random. I don't know why, but I do know sometimes erratic firing (pulling the trigger lots and balls just kinda popping out whenever they feel like it) means you need a new batttery! :)
Overall, the gun works well. It shoots fast enough, has way easy firing mode switching, and has easy maintenence.
The inaccessible breech, lack of eyes, and mediocre stock board make give it some weak points.