Well i was happy with the wise for the short 2 months I had it, up until last night. Strung about 50 rackets so far and yesterday it started to malfunction. I had it set at 52lbs + 10% prestretch. The machine should have only went up to 57.2lbs and then back down to 52lbs and beep to tell me that it finished pulling. I noticed that the unit started pulling all the way past 60lbs and then back down to 52 with a strange noise. The read out sometimes stayed at 0.00 for couple seconds when the machine was pulling. I took a video but haven't uploaded it yet. Bottom line is Im out $35 for shipping, rackets waiting, and aggrevation of having such a new unit malfunction. I asked Herb if there was any chance he sent me a refurb but he didnt respond yet. I will follow up this thread once I hear back from him about the unit and if I upload the video of the malfunction. I can only hope the unit will function withouth another malfunction when I get it back.