As far a quality... Blu is the best I have seen. Uses great materials, nice glossy finish, and the PCC is the best I have yet to see. But in terms of use... There are worse models, and there are better models. I found the vapor inconsistent, and battery life wasn't great. But the PCC and extra battery they give you make up for the battery life as long as you don't mind changing the battery every hour or two. With constant
vaping I found you get about 45 minutes of use, but by then the second battery was charged.
I personally switched to the 510 for the more consistent vapor, and the accessories like the pass-
through (which is great sitting at my computer for hours on end). Not to mention I didn't feel comfortable with the customer service and long shipping times of the Blu. I don't want to wait 2 weeks or more for supplies.