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I would NEVER buy a Grandee without wet testing it....I'm 5'11 190lbs and can sit like a rock in a Vanguard but when I get in a Grandee it's a nightmare, floating all over the place with no spot to "plant" my feet, very uncomfortable for me....doesn't make it a bad spa, this can obviously apply to any spa brand its just I have direct first hand experience with the Vanguard and Grandee...so ya basically like everyone has mentioned make sure before you drop 10-14k that you wet test, wet test, wet test
A couple of things to consider when testing a spa - the same spa will sit very differently with and without a bathing suit. With a suit I slide and float a bit, w/o I sit like a rock.Also, at first we liked lower intensity jets - after a few weeks we prefer full intensity jets, I think we got used to the jets after a short while.I hope this is not TMI but something you may want to consider....