Hmm, I suspect there are good and bad experiences and it's difficult to know what will suit your dc without giving it a go.
I took my youngest ds (hypermobility syndrome, chronic pain, gait issues including toe walking, sleep and fatigue problems) to an osteopath, aged 10 and later to a chiropractor around a year later. I'd heard good reports from parents of dc with hypermobility syndrome for both treatments, but not these individual practitioners. Unfortunately neither worked with my ds.
The osteopath was very clear that the treatment would start to work within a set number of sessions or not at all and said that if it didn't work there'd be no point wasting money by continuing. I got the feeling the chiropractor would have taken my money for evermore but we discontinued treatment as it didn't help and the work they do on necks worried me, especially given my ds's hypermobility syndrome diagnosis.
My ds is now 16 and has recently started seeing a private physiotherapist based at a sports treatment clinic and this is going well. We'd tried physio privately before at a place dealing with a range of conditions and that didn't go so well. I'd never considered places identifying as sports clinics as, although I know they treat other injuries, I didn't think they'd be the best place for a very unsporty, hypermobile ds with chronic pain. But this one is great. I got the recommendation from someone who'd worked with them previously.
Ds is probably NT, although currently being investigated for ASD after some issues came up when he went to an out of area hospital for a pain management assessment. He is, however, quite fed up with his condition and can be very resistant to approaches to try to help him as he feels he's seen and done it all before and nothing works. He is managing to keep going with the physiotherapy and the practitioner he sees has a sensible, down to earth approach. I felt some physios he'd seen previously (including NHS) either promised the moon in terms of improvement or blamed him for flunctuations in his condition so finding someone who got on with things in a fairly neutral way was much better. I think having a sympathetic person who "gets" your dc is as important as the therapy itself.