It is ABSOLUTELY worth every penny! It is my guaranteed plateau buster, and I come away from it looking better every time. I get muscles in places I didn't even think were possible on me, and feel SO empowered after the workouts. My DH is doing STS right now for the first time, because he got tired of seeing me get all the results, even though we were both working out. He's on Meso 2 and he's LOVING it!
I also totally agree w/what Melanie said about scale vs size when it comes to weight loss and STS. I'm happier right now at a weight that would have made me cry years ago, because of the body recomposition that I rec'd from STS. I also (on my most recent round of STS) lost a couple of lbs, and went from a size medium tops, & 4-6 bottoms, to a XS-S in tops, and (a slightly baggy

) size 2 pants. I definitely had no plans on getting that small, again! (high school size!). But, like Melanie said, the scale didn't move much, @ a height barely over 5'0 my scale still waivers from 118-120, but that weight made me a size 6-8 before!
As for the workouts, I think they'd be fine at the gym, or at home - although since Meso 1 moves so quickly it could be easier at home? They all hit around the 50-60 min. mark, so you'll be burning out just in time, lol. I personally prefer to do my rounds of STS in the cooler months, so I think it'll work out just fine for you
Let us know what you decide