I've had two cars stripped at Minus Paint in Adelaide, as long as you follow the directions there are no disadvantages. You'll hear horror stories about every process so don't go by anecdotes (My mate's, mate's, sister's boyfriend's cousin said...) try to get feedback from people who have actually had the work done.
From experience Minus Paint will strip the paint and filler, then in a separate process remove all rust, it's usally not pretty then they'll etch prime it.
Pics here -
http://www.fbekholden.com/forum/viewtopic.php?f=11&t=14003