Something slightly off about vehicle mode (the cab is too close to the trailer for one thing) but robot mode is one of the best so far in my opinion.
Face needs a little bit of work but it's still a good bot mode.
Next thing will be does he combine and what do the other Stunticons by this company look like (if there are any).
Good bot-size by the looks. Judging by his feet, though, the cab in vehicle mode will be a bit smaller than MP10. Can't have everything I guess, as MP10's bot is just the cab and Motormaster is the cab + trailer.
Bot mode is a good G1 likeness, Truck mode is pretty terrible, at that size will likely be half the size of Optimus.
this company I think it called Perfect Fusion, don't know how long they have been operating. They are currently releasing PF-01 not Slag atm.