It's been around for a while and it is an OK starter PV. In good conscience, I can't recommend any auto switch PV, however. The manual switch PV's are just plain better performers when it comes to thoat hit and vapor. There is suppose to be manual batteries for the 901 coming out this week.
For longer battery life (7-8 hours), consistent throat hit and very cheap batteries $2 instead of $12-$20 for most PV's, I would go with the Screwdriver. It uses a 901 atomizer and is no bigger than the DSE901 but you have all of the above advantages.