Are neck jets worth paying extra for?

One thing I've noticed there are a lot of conflicting recommendations online, so I want to learn from people who have actually owned one of these over time. Looking back, is there one thing you'd change if you were begin again right now? Real-life advice is usually by far the most valuable.

https://southwestspro.livejournal.com/1597.html

Swim spa or traditional swimming pool? 8_afd1e