Any tried Bootcamp Pilates or similar?

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Hi

I'm thinking of trying out Bootcamp Pilates (using the machines rather than just matwork) - there is a studio really near me and I've been advised by my work physio that yoga and/or pilates may help the bad back I've recently been suffering from.

http://www.bootcamppilates.com/

Just wondering if anyone had tried this form of Pilates (either with this specific company or just in general) and what they thought of it vs matwork pilates.

It's quite expensive but I can claim half of the cost back through a work scheme that we have so it works out slightly more affordable.

Also, how often would you recommend going? I currently (well usually, have been out of action of late) do circuit classes at the gym or bodyrock.tv around 4 times a week and also walk alot. Would once a week have any impact or is it more something you need to do several times a week?

Any advice / recommendations etc gratefully received.

Thanks