I have been to Nail Time a few times, and I choose it mostly because of the convenient location.
The place is definitely clean. It also lacks that "salon smell" that tends to give people headaches. Each time I've been there it is with a different size group, and they are accommodating each time to let us sit together, even if it means bringing the manicure station to the pedicure chairs for some multi-tasking. The employees are all very friendly and talkative.
I tend to get a mani/pedi because the combo is a much better value than either one alone. The pedicures are very good, thorough, and last. The manicures are a little more average, but I blame the quick chipping on my own clumsiness. I haven't tried any of the other salon services yet, not even gel manicures, despite the technician's up-selling attempts.