The reason(s) everyone is telling you that one sucks is as follows:
1. It uses vacuum to pull the brake fluid out of the bleeder, versus using pressure to push it through. I have an ancient Vacula setup and I never use it anymore. Pressure bleeding is where it's at.
2. Your hand would be sore for 6 months using that thing. 6 wheel cylinders and probably 30' of brake line to flush and bleed? You'd have to pump that thing 14,000 times to get it done.
3. You can buy the kit from Motive Power (that's what I have) or you can build one out of a $20 pesticide sprayer from Horror Freight/Home Cheapo/Blowes, etc. I doubt I have more than $50 in my setup and I can do both the deuce single circuit master cylinder, the 1987-1989 USAF dual circuit trucks, the M44A3 and the M39/M809 series 5 tons. Heck, my bleeder works on my 1942 GPW and my old '55 M38A1.
My old Vacula: Sold under it's own brand and rebranded by all the major tool companies (Snap-on, Mac, etc.) Uses compressed air to create vaccum. Problem is that it just can't pull brake fluid through the system like pressure can push. But it's better than nothing I guess and it is a one man operation.
What I have now, Note that these pictures depict bleeding on an M38A1, but it's the same for Deuce. I have since collected up master cylinder caps for all the popular stuff (Jeeps, Deuce, etc.) so I just grab whatever cap I need and I'm ready to bleed. My new company car Civic is the only thing I own that isn't DOT5 BFS.