I've had mine since last spring as well. I do like it, but we just don't use a stroller much so it hasn't seen much use. Generally the same thoughts/issues as outnumberedby6, but our wheel covers haven't come off. I always have to push the front of the seat down when unfolding to get the front part to lock open.
I also think it seems a bit loose, like you can wiggle the handle bars back and forth side-to-side more than you should be able to when it is unfolded. But, I've also never even played with another umbrella stroller, so they may all be like this.
The carseat adaptors are basically just two straps that hook onto the belt path guides and then onto the stroller frame to hold the carseat on to the seat. Seems to work fine, but they weren't very compatible with our SS1, just didn't fit. Would be an easy retrofit though.
I keep meaning to find a Mac instore to try out in comparison, but haven't gotten around to it yet.
Pics below, only ones I had, though they aren't the greatest. DD was probably 8mos or so.