I am the designer of KISS-488. In the interest of full disclosure, I want to correct a misconception (at least one that I got from reading Bratster's comment). He apparently means that the Tektronix adapters are "awesome"; he's not referring here to KISS-488 because I know he doesn't have two of them.
I designed the critter for my own use, primarily needing to be able to do screenshots from my scope and spectrum analyzer to email to clients and to document things for certification requirements. The data logger function was a clear case of "creeping elegance"; it was just too easy and slick to pass up (and like most such things, turned out to be a pain to implement, but I have it working quite nicely now). The sample screenshots in the manual give a decent flavor for the device.
It is not intended to support a full rack of instruments, automated assembly line testing, etc. It's meant for those of us who have a limited budget for test equipment. Some truly fine instruments are out there, and available for pennies on the dollar because nobody wants to deal with IEEE-488 (and I should know - I worked for one of the major IEEE-488 companies years ago!). I have one plugged into the back of each of my instruments, and they show up on my network with a Netbios address apiece, or I can talk to them at a numeric IP address. And I add NOTHING to the clutter on my PC - the browser is all I need. Indeed, I have an article slated to appear in Circuit Cellar later this year, all about using a web browser instead of an LCD etc., or a PC-based driver, that goes obsolete right after I'd buy it.
As to pricing, I've been told it should be priced higher, but I'm fundamentally a bit of a cheapskate myself so have a hard time asking more than I'd be willing to pay. Given that the alternatives (and I did a lot of looking) require a big outlay for cables, board, and software, plus a tremendous learning curve to drive the software, I think KISS-488 meets my needs extremely well. Compare to the alternative of buying a "modern" instrument with the same functionality but a built-in web interface - the total with an older instrument and KISS-488 is downright miserly!
Feel free to shoot questions my way. Although I earn my living professionally as a consulting engineer, I'm really just having fun making a living playing at my two favorite hobbies (electronics and flight instruction).