I took apart the SideKick & found out that the motor still runs good; the old brush roller end caps were full of dirt & hair. I put in a new roller & the SideKick works good again.
Now I just bought the Wessel Werk HEB160; tried it on the TriStar CXL, & boy did it pull out a TON of dirt from my mattress! I LOVE that the Wessel Werk HEB160 has brushed edge cleaning on BOTH sides; & the nozzle adjusts to a more comfortable angle, so even under car seats can be cleaned out thoroughly.