I have a C4moto, the frame is really sweet, im about 80kg and it holds up fine had it for about a month now. the lower frame is CNC machined billet and the upper is alloy Extrusion with fishscale welds, so yeah pretty strong.
Hubs are great like any other bike with billet hubs and 140cc lifan motor. being a midsize type bike more room to move around so you can really crank it over jumps.
The front shocks tho are AS03 (check their website) but i found that they are fine you just have to work them a bit, i put little packing spacers in them which took me about 10min a shock to do. my freinds got the AS02 which are still quite soft so hes thinking about doing the same thing with AS02 The fastace forks are really service friendly.