I've been a Real Estate Appraiser for about 8 years and have gone through 3 wheels and am now purchasing my fourth. My second wheel was the Keson RR112 Road Runner. It was great, reliable, and lasted me about 6 years. That wheel met it's demise when it became submerged in a puddle. You would think that since it's a purely mechanical device, water wouldn't cause it to fail, but i also attributed it to it's age. Since that trusty little guy lasted me so long, the next wheel i bought was the EXACT same model, about 1 year go. However, the quality was far inferior to the one I previously owned. I will measure the SAME wall 4 times, and it will give me 4 different measurements (+/- 5 feet at times!). I also have an issue with the handle becoming loose on me all the time, and there is no amount of strength in tightening it that will resolve this problem. All in all, i am so disappointed with the quality of this wheel that i am wasting 10 minutes of my work day on the internet (other Appraisers must know how this is) to relay this information to other appraisers in hope that you all steer clear of this wheel, unless of course you're the gambling type, then knock yourself out. I myself am going with the Rolatape MM-12, which my boss has been using for several years. You can feel the quality in the MM-12's tight handle, AND i measured our office wall 5 times and got the same reading 5 times, which is the most important part.