The .40s have gotten fairly good reviews on Airsoftsniperforum and I'm using the .28s. They're much less slippery than ASG blasters. Don't think they're rebranded BB king ones since BB king don't have the .28s in pretty pink.
Funny you should say that UTJ, you are the second person I have heard not massively slagging off their ammo. The other being me say "eh it's alright I guess" Seen multiple guns not feed with it but mine do.
Personally their BBs have been alright and I tend to just use Abbey gas as it's always worked fine for me. I was only aware that there was anything wrong with their BBs after having both guys I currently play with rant about them not feeding. Sunday gone one of the guys couldn't get any pistols mags to feed at all on them. He switched to excels and they were fine. If your gun doesn't like them, which seems common they suck but all my TM guns don't mind them.