Unfortunately OP I'm very sceptical about most of these hyped up things. By all means spend your money, but I would say don't expect anything more than subtle, temporary results.
There's a lot that can be done for improving skin tone/ texture etc. I love skincare, have used tretinoin for a few years, and also have an LED mask - all great for giving a nice glow to the skin etc. But if you are talking skin tightening, you are really about laxity in the skin or sagging, there's not much that can be done bar surgery. I know that lasers can have a subtle effect, but often it doesn't last that long. And the recovery can be harsh.
The aim of most lasers/ RF/ CO2 etc. treatments is to give a controlled injury to the skin, thereby triggering your body's healing response - which includes a temporary increase in collagen production. But again, that mostly has an effect on your skin, rather than the underlying facia and tissue and fat pads - which are what really causes sagging and jowls.
I previously had Ultherapy which made all sorts of claims about getting into the deeper layers of tissue, and tightening etc. but really I saw very little results for a lot of money spent. Basically, if you only have a very small amount of skin laxity, then you might see an improvement but don't expect miracles.