I received some LR 306 and reg 306 attys along with some drip tips for them in the mail and I'm extremely impressed, much more flavor and more vapor than the LR 510's and reg 510's and for those that don't know they have the same threads as a 510. I honestly can't see myself ever bothering with 510's again
Now I have a shedload of 510's sitting in the drawer that'll never be used lol.