Cost are minimal on most ctls w aftermarket parts. On my tl140, tracks last 1000hrs with alot of pavement use, sprockets last 2000hrs, and i think i will get at least 2000hrs out of bogies. I can get tracks for $2200 a set, sprockets for $500 a set, and bogies are about $200 a piece. On mini skids the tracks seem to last about 500 hrs. Mini's are freakin awesome, but sometimes you gotta have the big boy. And i change all my components myself. I can even get install a derailed track on a jobsite with a grease gun and a couple wrenches. There is one youtube video that changed my life on track changes even on large ctls. I can do two tracks in an hour with a dingo helping.