First off, beaware of the private clinic. They post +ve reviews of themselves on here just to balance all the -ve feedback they get from customers. They are overpriced and there are better clinics around.
I used the skin health spa in london, and it was a hellof a lot cheaper then what private clinic was askng for. 3 treatments for £320 (march promo) and that includes a glycolic peel before hand. This is needed because the skin needs a 'prep' before the nlite so the laser can penetrate deeper. Its more effective that way, or you could try a microdermabrasion treatment (crystals).
My results varied, the first time i went for a course, i was amazingly clear for about a year. Then i got the occasional pimple here and there. After christmas i broke out horribly and linked it to all the sugary foods i had during xmas.
I am going again for another course