I flat-out disagree with what's been said so far. I've had a hot tub for several years and love/appreciate it as much today as the day I bought it. Admit I don't use it as much as I did six years ago but that's more due to the fact I went overboard when I first bought it and literally lived in it.
It's definitely not a 'plug-it-in-and-forget-about-it' piece of equipment but I'm not sure what others mean by 'high maintenance.' I clean the filter and skimmer basket once a month and check/rebalance the water weekly. Cleaning the filter takes 15 minutes and checking the water about 5 minutes. Leaves in the fall aren't an issue if you have an insulated cover (which also reduces electricity costs.) I drain and refill my tube once in the spring, winter and fall wiping down the interior at the same time. Never had to clean my jets, in fact can't see them clogging up with gunk given the force of the water going through them.
In terms of reliability, I'd go with a well-known and established brand . . . like Coast, Beachcomber or Arctic Spa and stay away from the Home Depot/corner lot weekend tent sale units. The better made spas are better insulated which saves you a lot in heating costs. Spas are like anything else . . . you get what you pay for.
I'm lucky enough to live on the shore of an awesome lake and nothing beats watching the sunrise/set over the lake from my tub with a cup of coffee/glass of wine . . . or soothing sore muscles before dinner after a day of raking leaves. I added a retractable TV to the side of my tube and love watching the Jays or Leafs while having a good soak. And, of course, few things beat hot tub sex.
All this said, there are many who think like the previous posters. In a way, that's a good thing for first-time buyers as it means you can usually find a well-made unit for a bargain price on Kijiji. In my opinion that's a good way to 'test the water' so-to-speak without breaking the bank.