Beware, these things are for low detail or worse no detail pulls. And the type & thickness of plastic you use makes a big difference. I've tried this in my kitchen and had the center heat well, but the sides didn't and by the time I got the sides heated, the center was cooling, so getting a good pull was very frustrating. Obviously the temperature of where you're pulling makes a huge difference and I am pretty picky about my vac pulls getting tight sharp detail.
I'd love to see your set-up and pulls, so please share, I destroyed mine long ago, but I am considering a newer, more metal version, just need enough capital. (don't we all:lol)