The Hannah one is pretty much the same, but goes for a few bucks more. I understand your reluctance to spend that kind of scratch on a "test kit", it took me a while thinking about it before I bit the bullet. What I can tell you is that my test kits were giving me readings of about .1
When I tested the first time with the colorimiter, my P04 was at 1.54 mg/l.
It's worth the money, if you can swing it. Another option is to approach some of your club members and go in on one together. Once I got my reading down to acceptable level (below .1), I only test once or twice a month. I don't need that expensive piece of equipment around all the time.