I have the intel 3.5's with the 10 rpm motor. Never had any problems with it except the little wheel gets worn down on them after some time. I have to lights on it so that could be cause ing to progress alittle quicker than normal. I dont think there are too many options on them but I didnt look around a whole bunch to be honest. I saw some with chains and such but I didnt want anything like that. The 3.5's are quite and you can make a bar to add a light easily with some stuff you can buy at homedepot for 6 bucks