I have 2 very specific needs for a CT SYS, vacuuming the AC condenser coils outside to remove the "cotton" from nearby cotton wood trees and vacuuming train tracks that run along at the 8 ft level for LGB garden trains. Both tasks need to be done at least twice each year and using the Miele canister vac with a 5' hose is just not very convenient or easy. My present options are to drag up CT's from the basement or drag in CT's from the garage.
Actually, the CTC SYS would work well if the run-time was longer than 14 minutes.