I bought this RDA so I could get the nice little Hex Screwdriver... but anyway I thought I would build it with a single coil and test it... glad I did because it's a pretty good RDA... I love the airflow and the way the airflow works and the fact it's almost impossible to over squonk! The flavour is pretty good as well! As always these RDA's come with an 810 drip tip which I smaak nothing... and unfortunately it doesn't come with a 510 adapter... so I stole one from my Recurve... Happy Days! The little Hex Screwdriver is a Chicken Dinner of note and the RDA will stay in use now I have a few Squonkers that need BF RDA's!