I have stated before, and will again, that when it comes to drilling concrete, for any reason, Hilti is the only way to go. I started working for a large concrete company two weeks ago on a cast in-place concrete structural framed parking garage at Cincinatti State University. On the current deck we are working on (the 6th of eight) we have no less than three and often as many as seven Hilti's running on generators almost all day long. We have everything from the TE-5 to the TE-75 (the big mutha) and drill from 1/4" for short anchorage points and bracing to 5/8" and 3/4" and bigger for larger anchorage points for hanging 16' x 12' gange forms on sheer elevator walls. Yes, they are pricey, but if you consider that if a drill breaks and you can't make a pour and have four guys standing around making ~$25 per hour, the money adds up really quick. It's cheaper to buy equipment you KNOW will not leave you stranded. FWIW.
Eric