I had the 10428 (Ripmax version) some time ago....in fact still do (in bits) ! Yeah, it was OK....swapped the electrics out, as you say...bit naff. Was a bit top heavy so l moved the battery down low & as I could only get a 2200 in there, I stacked another one on top so I could just unplug one for the other when one ran out. Lots of articulation with them so they cope quite well with most terain. For the money, I think that they are quite good for a bit of fun 😉