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The "bigger" grinders like my 7" Dewalt will sure do some mean grinding, but boy are they heavy & hard to accurately control. Too heavy for anything but short jobs, where you've gotta move a lot of material � for that they a super!. I have three 4.5� grinders: 2 DeWalts & 1 Milwaukee. They each do a fine job, but the higher the Amps the more power each has. It's all (well, mostly all) in the Amps. Each Mfg make a several different models so watch out for the amp rating & get the most amps for the $. The location of the switch & how you will use it is worth looking at. I like a �deadman� which cuts off if you drop it. Otherwise it may be wrapping around your leg � or worse! Come to think of it you make hang up a wire brush in the belly of your shirt like I've done - in which case the deaman sure is nice! My very favorite is a 4� Ingersoll-Rand (air) grinder. It�s light, very fast, very easy to control & for some reason (probably RPMs) it accurately moves a lot of material. It makes me feel � ARTISTIC! I love it! I also have a $19.00 Harbor Fgt 4� grinder that isn�t really all that bad, but I wouldn�t want it to be my only grinder. It makes a ton of really ugly sounding rattles � like it�s gonna die, but I've had it three years. If you get a good grinder you may want to put up $19 for a cheap one & put a wire brush on it! When it dies order another, and then another. If you live to be 100 you�ll still not have paid as much as you would have for a super class Milwaukee! You're not talkin' brain surgery here so just go with a name brand 4 or 4.5� & you�ll live happily ever after. Oh, do wear good eye protection NO MATTER WHAT!
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