I've had it done, the Priadara one. It was amazing, it was quite heavy and I did ache a lot afterwards but it was a good ache and it really felt like the tension was kind of pummled out of me. The smells are brilliant and the oils from Priadara are gorgeous.
I'd say it would be unsuitable for those who are frail, have osteoporisis, arthritis etc as it may be a bit uncomfortable for them and possiblt do more harm than good. Also, they are hot so low blood pressure etc would be contraindications.
Hope that helps! :biggrin: