My wife is a pain sufferer so she uses it all the time. I use it outside of summertime. We have had a Hot Springs Vanguard since 2004. Only issue has been a burnt out control board that I replaced myself.
I have not kept up with new models, but Hotsprings used to have a 110v model that could only run heat or jets, not both. I would never do that. 220V models are the way to go.
They sell a simple metal U shaped pole that attaches to the hot tub with hinges that lets the top fold over and hang over one side of the spa that is easy to use. Hotsprings has filters that can be cleaned in the dishwasher. I would get these. An ozone type of system will reduce chemicals, but even without one, an ion system with MPS does not stink at all. Only minimal chlorine required regardless of the system (after heavy use, etc.).
I put mine on a concrete pad. Wood or synthetic decks have to be reinforced significantly. You will have to trench conduit to the spot so take that into consideration. The 220V line will run to a subpanel that you will need to mount. We purchased new which included delivery and setup, but, the wiring is not included. The hot tub people did make the final connections.
The model we purchased sits 5 and can squeeze in 6. I like the room of this size even though it is one or two of us using it. While we use jets when we first get in, most of the time we have them off. We have LED lighting with multi colors. Used it when we first got it, don't really use the lights anymore. They had a stereo option but honestly we prefer quiet.
At the time, the two that I considered were Hot Springs and Dimension One. Your local dealer needs to be a good one. We had a good Hot Spring dude (though he pissed me off later) and no Dimension One dealer so we went with Hot Springs. While you can buy chemicals and generic stuff at an pool or spa place, a good local dealer is nice to have for repairs, questions, parts, etc.
Most all of the spa places have demos set up that you can get in that are filled. We did not do that, but we did sit in several models. For us, we did not like lounge seating. Lounges take up a lot of space, so make sure you want one.
Our ion cartridges last three months or four (can't remember). A garden hose attaches to the tub to drain it. Once drained, it you really only need to wipe it down with a non-soapy cleaner, clean the filters which is hardest part (and why I recommend the dishwasher ones), and refill with a new cartridge. Really not a big deal.