I bought one of those several years ago. I found it to be very unstable because of all the slop in the hinge points. The transmission would flop around and felt like it was going to tip over or slide off. I also found it very tedious to set up for a transmission with a flat pan. Transmissions with a rounded bottom would settle into the cradle better but the whole thing would wobble around. It does have the advantage of adjusting for an angle, but turning the adjustment screws is difficult because with the slop it will tilt back and forth from where you want it.
I made this simple plate for under 20 bucks. I've used it many times, works best on transmissions with a flat bottom, but I've shimmed it up with some small pieces of 2x4 for some others. I've got spots I can slip a small safety chain to to hold it secure.
Neither mine or the one posted will be safe with a transfer case attached!!