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One thing I wish I did was leave a whole in the concrete and come up through the bottom of the tub instead of having the wire come into the side.
We slept like babies afterwards. It was almost like it knocked us out! I started up the tub early Friday morning and didn't actually get the spa marvel added until Sunday afternoon after adjusting the Alkalinity and PH and Cal Boost. It's a twilight 8.25. The wifi was not installed but the dealer came a fixed that. The jets are awesome - good power and you can move the power around. The only negative thing I don't like is the controls for the lights. you have to turn them off quickly to change the color. I find it annoying and wish there was a different button to change the color.