This is all very true. Your green spill worries go from talent’s back to talent’s front but this is easily fixed by putting some distance between camera lens and subject as well as finding the right mix of iris and green light. 2 practice set-ups will dial you in. I’ve just finished an entire series for discovery where I used this set-up on every shoot and it worked perfectly.
If you’re traveling a lot, this thing is worth it. My green screen set-up travels in a pelican case not much larger than a lunch box. 15 min set-up and a solid key everytime. My screen even has a seam right down the middle and it has never been an issue.
What you lose in initial investment you gain back 10 fold with the qucik set-up time and not having to rent syc lights or a lighting guy. You’ll hear a lot of lighting guys dog this system but don’t forget, you’d be dogging it too if you were losing a day of set-up.