I recently took a class on stringing inlay, primary tool used was the Veritas one. As the last of these types of tools on the market, it's pretty much the only choice if you want to buy a tool and get to work instead of learning to make the tools you need for a somewhat esoteric specialty skill in period furniture making.
Bottom line is that I like the tool. It worked well for the job, and costs far less than my time designing and making a wooden one a la Steve Latta's. Ordered one from Lee Valley yesterday.
Pros are a solid build with one minor exception, easy to set, holds that set, and is intuitive.
Cons are the minor exception (screws mounting the cutter head on the rods can come loose and they did once on the one issued me for the class), and the cutter. I found the cutter to be too aggressive in the wrong way. I think the Latta style cutter is probably a better choice, and I'm going to make a few to mess with once the tool arrives from LV.
Any gripes about the cutter are irrelevant to the tool itself however. You can get spring steel stock from sources like McMaster-Carr and file yourself up a few cutters of whatever style you prefer (there is an oval hole required, but anyone filing tiny teeth on cutters shouldn't be much deterred by that!)
Lie-Nielsen seems to have stopped offering their versions of Latta's tools, so I've opted to order the Veritas one and play around with making blades of my own. I would recommend anyone serious about stringing inlay to make a version of Latta's trimming tool for shaving a little off the string so it fits in the plowed groove. Beats being stuck with making cutters to fit whatever thickness veneer you can get to cut stringing out of!
If Rob is still looking in here, I would suggest offering both styles of cutter. Once I do my homemade Latta cutter I may end up using the Veritas pattern anyway, but I'm a stubborn sort who has to prove which works best before using it.