This thing rocks. I know that there are a million different options for vises. Type of vise, placement of vise, should I even have a vise? Well, this option is my favorite for several reasons.
1. It was free.
2. It works.
Okay, just two reasons really.
Here's how I made this great blue wonder into a woodworking vise - I screwed it (through a piece of cherry) to the underside of my bench. I had to mortise a long hole for the back part of the vise to sit in, so that the front of the vise could close flush to the side of the workbench. From there, I screwed on a large piece of ash that I had bought to build an ax handle.
From there, I drilled two holes in the top of the ash, in line with the holes on my bench. Quick side note - drilling through ash with a 3/4 spade bit is not as enjoyable as it sounds. Then I ran to Michael's and bought two different colors of leather. Which they sell in 8 1/2 by 11 sheets. As if I am going to use them in my laserjet. Side note #2 - Michael's sells a lot of things that woodworkers can use. And they ALWAYS have at least a 40 percent off coupon online, sometimes 50 percent off. This leather was like five bucks by the end.
The last thing I did was to add holes going down the opposite leg of my bench. Bench dogs in these holes support my longer pieces. That's really it. I like it because it extends about a foot out from the table. If I am trying to plane something like a panel, I can pop two dogs in the vise and two on my table, and get about 30 or more inches in there. When jointing, it holds boards tightly against the side of the bench, with or without the support from the other leg. It will even work if I put a piece in vertically to plane end grain, with very little wiggle.
If I had to spend 150-300 dollars on this like you may, I might make a different choice. This may not be the perfect vise for everyone, but if you've got an old one, or find one cheap, I'd recommend it wholeheartedly.
A note on the letters - D stands for the pop up dog, which I do not use, the E is the designation for quick release. I definitely recommend the quick release.