Olympic Tall Boy question

I'm looking at a Milwaukee powered Olympic Tall Boy supposed to fasten plates on rubber roofing. Does anyone use these drill/drivers. A friend bought 2 of them from an outfit going out of business 2 years ago and hasn't used them. He retired and wants to part with them. My question is: are they worth looking into or are they useless. Thanks

We use Dewalt "stand up" drills,they are a back saver thats for sure.I havent seen a milwaukee stand up in a while,but many moons ago when we used them i remember that they were super powerful.Some types of stand ups require you to drop a screw into the barrel,I found they jam up to much (most likely from "did i drop a screw into it already?)If you plan on laying vast amounts of roof in a work day then sure they save time and money,but 10 square or less i wouldnt waste your time.If your pal wants to part with them,test them out for a job or two before you buy them,see what you think,good luck