I'm riding in a Helite vest, despite the reservations I had in that old thread. Some ex-biker was selling his for cheap, got it for 1/5th of the retail price.
I wouldn't have bought Helite for full price, after having it for a year, because it's a bit of a pain in the ass to put it on every time and its weight and bulk is noticeable on top of your jacket. It's definitely not "invisible".
I wasn't as bothered as I thought I'd be by airflow/heat. I'm not getting cooked while riding in summer, it's actually fine.
If I were to spend 700 bucks, I'd try out either Alpinestars Tech-Air 5 or Dainese Smart Jacket. Both cost about the same (and about as much as Helite), both are electronically triggered, both can be worn under your jacket. The downside is that you need to send them back for refitting once they blow, while with Helite you can replace the CO2 canister yourself and it's cheap.
2015 Versys 650