My fiancée has a Thruster branded 'fixie' (really, it is a flip-flop hub) single speed bike. It's the black one. He loves it. He rides it far further and more often than he did his entry level road bike.
I'm no expert, but it seems well made. The frame is nicely put together and it is very stable. He can ride quite a ways no hands. The frame has 'track ends' and sadly, no attachments for any sort of cup holder or rack. The thing is lighter than my bikes direct Windsor and my old 80s Schwinn. The wheels came true, too. The frame stickers were literally stickers and I peeled them off because I could.
The components are a little odd and somewhat chintzy, but again, they seem sturdy enough. I figure we'll just replace them if and when they break.
We bought it off the interweb so I can't speak for assembly other than the front wheel was screwed together way too tightly.