Couple months in and thought I'd share some updates - I know I scoured the internet for detail before buying my spa and found very little ;-)
So I have the summit w/ microsilk and run it in Canada (southern ontario). So far, it's warm so no review on how it works when it's super cold.
So far, I'm really enjoying it and very glad with the purchase but some quick details;
Spa-Frog in-line - pretty much think this borders on useless. I don't use it and switch to granulated chlorine. If it does work, it's not cheap to keep that way.
Jet Pressure - after months of use, I'm really good with this. If you want massive pressure, the whitewater jet is insane. A couple other seats have decent pressure
Seats: building on the above, the 7 seats are all pretty unique in terms of jets and seat height and I find myself (6'4, 200lb) using all them with no favorite
Above might be my favorite thing - the tub is huge and offers lots of seating variety.
Size: Usually it's me or my wife and I, but we've had 4 a couple times and 6 adults once. Love the size for all those groups.
No issues on the performance yet - did replace a control plane early but super support from dealer, and had one of the jet covers break and again, also replaced right away.
In all, despite it being pricey like crazy, I'd buy it again.
P