IMO they're too expensive but they are good. I just use a silk screen that is 120 micron I think. It cost me a quarter the price and the only difference is that it doesn't have the sides.
I love these things. It seems like someone always comes into a thread like this and lists the crap you need to DIY and I roll my eyes so hard it hurts. This is a cool product and I'm happy to buy it!
I got a trim bin, it works great but I have no idea how much they cost because someone gave it to me. The Mobius I do know how much it cost but typically only pull it out if I'm doing over 1000lbs.