I've got one of those that I never give any credit on here. It's a Proto J5457f -- long handle, Facom mechanism. Got it from a member here in new condition. Thing was lacking when I got it -- mechanism didn't feel very good, and the head wouldn't flex all the way backward. The first really stuck bolt I broke free with it remedied that second problem. Took a while to fix the mechanism. First I added super lube, which made it better -- still didn't feel as good as my Facom ratchet. So I tried assembly lube in it, and now the thing feels like the excellent ratchet that it was designed to be.
With a little work, it's smoother than my 1/2" Dual 80. The head is almost the size of a 3/8" head. It'll go anywhere, and it's STRONG. The last job I used it on was changing out drive shaft collars which required final torque of 280 Newton meters. Highly recommended if you don't mind giving it a little tweaking.