Like most people turned off by the $80 price tag on the HTC Flyer pen I did not pick one up until recently. As usual, once I identified that I wanted to try this based on other's favorable remarks, I searched for a deal. I found it on eBay where there was a seller with brand new ones in the box for $50 and free shipping. Still not ready to pull the trigger I waited for several days and just watched the thing wondering if I should get it. Then one day there was a price reduction to $30 and free shipping and I snapped one up. I wanted a spare pen because the OEM pen from my T580 finally gave up the ghost and died completely. I put the OEM pen from the Q550 into service but now I was down to one pen and wanted another. I figured I would put the OEM pen back into the T580 pen garage and use the Flyer pen on the Q550. So far so good. So after two whole days of using the Flyer pen I can definitely say this is a highly recommended switch. Find a similar deal on a Flyer pen and buy one. Here are my observations to back up my recommendation: - the pen slides across the screen smoother. The tip is different and it works better. - the pen makes less noise on the screen, including punctuation taps. - the cap for the battery compartment is all metal and there does not appear to be any annodizing on the threads. - the second button works as an eraser on the Q550 (I have not tried the T580 yet) when inlking in OneNote or ArtRage. It will likely act as an eraser when inking, period, but I have not validated that yet. I can only hope that Steve S. is correct and that there will be even better pens available from N-trig soon. For now, however, the Flyer pen seems like an 'upgrade' and not just a replacement.