Congrats on your purchase. Read up on the blind squonk to perfect your juice feeding experience. Unlike the Vmod you don't have to tip it to fill a chamber to feed the juice. Squeezing the bottle does the work which is more straightforward and efficient. Standard ejuice bottles as well on the mini and no proprietary attys and gaskets to worry about.
How much liquid that ends up in the catch cup is very atty dependent. While the expensive HH.357 not only have terrific flavor and vapor, the catch cup stays virtually dry. If you travel around a lot with it in pockets or purses, the HH.357s will save you on wasting juice and cleaning up small messes. I found 306s were the messiest, but their flavor and vapor were good and much less expensive. I still use hh.357s on my mini for travel, but have switched to the RBAs on my big boys. You might want to ready some of the threads that talk about RBAs for the minis, I haven't tried a mini sized one yet so can't recommend one. Just love them in general.
Lastly, don't forget Rob covers his REOs no matter who owns them. If yours is more gunked up than you like being used, you can always send it in for a relatively inexpensive rehab.
Does yours come with the bigger button? They are well worth it. PM if you don't have one, I bought a bunch of spares because I lose things, but they stay on so well I still have them all.
Dang I type too slow, sorry for the repeat stuff.