I bought one of these to give my road bike, which I use to commute on, a break. "Assembled" it last night (it says it's sold boxed, not built, but it came as "built" as other mail-order bikes come, so, fine) and rode it to work today.
Pretty, pretty pretty good. I've not ridden a single speed before (my only other current ride is a slightly-modified Triban 3 which I've been using to commute on and for weekends for long rides for about a year) and my commute in London, 12km each way, is fairly flat, so a single speed would be ideal. This rides nice, though I can feel the bumps way more than in my Triban. Getting up to speed from a stop was a bit of a shock this morning, but looking at Strava my speed/time was no different than normal, and I only assume this will improve. Brakes feel alright, though I will probably replace the pads with something else, as well as the tyres which feel rubbish, and I'd prefer bullhorns and SPD pedals. It's a bit heavy (I reckon 11kg), but I'm hoping this helps with the "bullet-proof"-ness?
Once I get stronger at starting I'll swap the hub over to fixed and have a go at that I think.
Mainly I think it's a decent buy if you want something for chucking about and something low-maintenance.