Just so you know -
The 'Aria' has the same footprint as the Vanguard, but has more powerful pumps, more jets in greater variety, and has a lounger. Costs more, of course.
If you enjoy a reclining seat in your tub, you should look at the Aria as well.
Also - the "Envoy" is similar - but it is a 7'5" x 7'9" rectangle.
These two spas are HotSpring doing the 'more power, more jets' approach. Ozone is standard, cover comes with it, most dealers include a full-service delivery, some will include a lifter and step on these higher-end units.