I had not yet heard of the Amore Bay spa... I got the D1 Sarena Bay last fall and the Amore Bay wasn't available yet. Pretty new, I'm sure.
As far as quality goes, I've been really impressed with mine. I had a cracked pipe union when it was installed, but not a big deal to repair. I just noticed the other day that my underwater switches weren't working, so I'm waiting on a call back to get them fixed (not sure what the delay is -- it's been a week!). I'm sure it will be an easy repair as well - probably a fuse or something like that. I'll report back on it when it's fixed.
The Amore Bay also has one of the programable Dynamic Massage Sequencer seats, which I really enjoy on mine... you can set the thing to go through several different massage patterns. I don't like to have the jets just blasting on me all the time, so it's nice to have it automatically vary the massage.
Make sure to wet test several types before you buy. The D1's don't blast as hard as some, so if that's what you're after you may be disappointed. I really like mine. The ozone generator is known as one of the best in the industry, and I've found the filtration system to work really well. I just did my first water change after 7 months of light to moderate use and the water was really still ok. The spec sheet on the Amore Bay indicates it uses the "Ultrapure Plus" system, which adds a UV system to the ozone and silver ion cartridge. Way cool.
The 4' brook and 3 (count 'em, 3!) fountains sounds really nice. I just have one fountain
How can I possibly go on?
Anyway, I can recommend the D1's, especially the higher-end Bay series.
Good Luck in your search!
Larry Becker