I have an SP3 i7 256GB and when I opened it and fired her up...I tried the pen out. Wow was it accurate. It was literally just like a pen and paper. Then after about a month, it wasn't working as well. For instance if I write the word "Microsoft" in regular letters (not cursive) the M comes in fine, the I doesn't show, the CRO looks good, then the top of the S is missing the - in the F is not there and half of the top of the t is missing. However when I wrote this word when it first came out it was perfect. I thought it might be the settings or calibration. I tried new calibration settings, but nothing. So, I ordered a brand new pen...maybe that was it.... NOPE. This brand new pen does the same thing.... The problem is that I do need the pen to be like flawless because when I'm signing documents or having a client sign documents, we really can't be going back over letters and stuff. Anyone else experience this? P.S. Love the SP3 by the way. It's now my main computer for the office and home. Completely mobile and love it.