I've not used one, nor am I a doctor. I have been on several devices in my life (in hospital) and undergone quite a few different types of treatment.
It looks to me like it gives complete support to your body then massages and moves your spine whilst supporting you. That's unlikely to do any harm. Six weeks of that is going to help most people who have issues (barring slipped discs and actual fractures). I think the machine will probably help overcome spasms and speed healing (massage encourages bloodflow which always helps with healing)
Trying to replicate the same result through exercise at home would be difficult - requiring quite a lot of experience (I think I could do it to myself but I shudder to think what I've spend on physio, alexander technique plus time spent in hospital over 40 years of treatment for spine pain).
Trouble is, bulging discs can be minor or serious and extremely painful (or start to cut off blood supplies, press on nerves and be disabling). I wouldn't trust most massage therapists, yoga teachers or pilates people near me if I had Mrs Bolt's problems (and never a chiropractor).
