I've spent the last couple of hours reading various posts about other PV's. Even though I'm new at this, I gotta say I'm exteremly happy with my NPRO. I have not had any issues whatsoever. Granted I have not tried other brands, but I dont have a desire to switch yet. The vapor is great, my battteries last all day at work and all I do is add drops (wet your stick & I did purchase the dolce & grape today after reading the rave reviews). I'm glad this is working for me. I have tried to quit analogs before, and this is by far the best thing to come along.