The only problem I have with them is I bought one, set my panel up, then years later went to redo my set, as over time, naturally plasma panels lose brightness, and found out they are only good for a short while, and the meter was now useless! As long as you don't think of them as a long term investment, you will be fine.
Mine was an Eye One Pro too, so quite an investment for one use
That guide is the one I used too, though it has now been updated looking at it. Top guide it is too.