In my opinion, no, but at that price it might be worth giving it a try anyway. Are you a support tech or do you care for a lot of problematic personal systems? If the answer is 'no' to either or both questions, I'd say that it's likely not worth it.
I'd do a little research and maybe see if you can find the product reviewed. Also see if there is any kind of compatibility list; i.e. motherboards that the product simply doesn't work with. When I was still doing Help Desk management, one of my techs had a similar board and we found that it threw out false POST codes on some boards and configurations. That may have just been his particular model and not a problem shared by all such diagnostic cards.
If you do decide to give it a try, please let us know your experiences with it here.
I do go out and fix some computers once in a while so if it works, this would be very handy for me. I tried looking for others for comparison and the only other one I could find was this one that doesnt seem as good. Apparently these are not very popular; there's not a big selection of them, which is a mistery to me since they would be a time-saver for any tech.
I guess I'm gonna wait a little while and see if I can find a review or other cards for comparison and then go ahead and get one. Will keep you informed on how it goes.