My spa looks very similar to yours although it is barrel shaped. Mine is too small - yours looks a little more roomy. Someone once said that spas should be oval or horseshoe shaped so as to avoid the legroom problem you refer to.
Having said this, we don't use our spa a ton, and we're happy with it. It's handles 4-5 people fine - any more than that and it gets cozy. Again, we don't use it a ton, and when we do, we're in it for no more than 30 minutes.
SF