While temporarily working in Modesto I signed up at Intersport and immediately regretted it. The building and equipment are grubby. Typically 75% of the low quality CV machines would be malfunctioning, usually with slipping belts, random failures of the drive or faulty readouts. I guess I was attracted by the low price but you still don't get what you pay for. Read the draconian contract terms very carefully as well.
Cons: Dirty, dangerous equipment