Other than the fact that the bridgeless one won't have a bridge, what are the differences? Does one work better for different types of e liquids? Also, what would be better, a 510, a 510 bridgeless, or a 306? SR or LR??? I've never dripped before, but I have a bunch of 3 ml samples, and I don't want to fill up a carto or tank unless I know I will like it. Do I need a drip well? I don't see too many drip wells that will work with a 306. I have seen kits that have an 510 t0 510 adapter, a 306 atty, a long 306 drip tip, and a drip well. If I bought these pieces separately (in order to have a drip well for a 306), do I need the long 306 drip tip? Will a 306 drip tip fit into a 510 drip well? Sorry for all the questions; I have so many odds and ends that don't fit together. I don't want to make another mistake.