It looks like the majority of complaints from these sites are slow shipping of cert or origin and/or the shipper damaging the bike in transit.
While I do like the look of the Icebear more than the Grom, the $2k price tag puts it only a couple hundred dollars off a clean used real Grom. On Chicago's CL I've very recently seen two low mile Groms, one for $1,800 and another for $2,200. And if you only want to do wheelies and other stunts, get something cheap like a TaoTao Hellcat. A search of Grom forums seem to show that not even real Groms are fond of burnouts and wheelies with a number of blown engines as proof. But if you really want the Icebear, I say go for it! And please make videos and such because I do find Chinese bikes to be pretty interesting.
I have a Chinese 150cc scooter from 2008. The GY6 in the thing has been dormant for over a decade but a couple weeks ago I got it to fire after putting in a new carb. Now once I get my fuel issue fixed it'll become my "Mad Max Rat Rod" for the Gambler 500. I don't expect it to survive the rally and that's okay, I only spent about $200 on the thing.