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Our club bought the Ideal 250 watt version many years ago, along with sets of replacement blades including the standard #4 it comes with (I think about 1/4") and a larger 1/2" wide blade. Besides grooving you can also flip the blade over and cut sipes.
I don't know how many sets of tires it has been used on, but it has been a bunch. The key is you need to plug it in and let it sit for awhile to get hot, and while grooving you might need to stop periodically and let it warm back up. It is also easier the warmer the tires are, as in letting them sit in the driveway on a nice hot and sunny day versus going out on a 30 degree day. I did break this rule the last time I used it since the truck was sitting outside in 40 degree weather all day and had only been in a heated garage for around an hour before using it....I still grooved and siped a set of 38" Swampers in an hour.
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