I just got a Sovereign Phase II less than a month ago. Fortunately I read a lot of topics on this forum about hot tub selection. The two most common tips were to wet test, and dealer satisfaction. I found two tubs I liked a little better (Sundance and Caldera) than my Sovereign, but we didn't have a local dealer (90 miles away). The dealers both would sell and work on the tub, but it would cost us a service charge.
So I still got a very nice tub at a local dealer. Since the tub was delivered I've had a heater go bad 2 hours after delivery, moto massage needed adjustment since it hit the shell when it changed direction, and now my bar top lights need a harness replaced. I'm very dispappointed in my tub's intital quality. But I'm so glad I went with the local dealer, and one that I liked. The dealer has helped a lot and been out to fix every problem immediately.
So my advice is only get the Envoy if it has a warranty. The Vangaurd is an awesome tub. But keep in mind it doesn't have a lounger.