Don't bother getting the inexpensive Loos guages... get the more expensive ones, as they're easier to use and a good deal more accurate.
Wasn't going to. (If I do it.) Was going to go for the "Pro" version. For my rigging (the diameters of which are yet to be determined), they look to be running around $85 or so.
The price difference isn't all that much, especially if you consider how long you'll have them.
About $15 to $20 more, or so. I agree.