I've been using the Liquinator tank for almost a month and I love it! This has also been my first jump into cartomizers (I'm using regular resistance Boge 510 cartos in the Liquinator). You can also purchase LR cartomizers.
It's so great, I haven't touched an atomizer in all that time. This is really great trouble free vaping (if you don't mind the big knob on top). I haven't had a single spill or leak and I got used to the tank on top quickly (I'm using it on a Darwin mod).
Keep in mind, you can either buy precut cartos or if you have a Dremel you can do it yourself and save some money on great deals on 5 packs of cartos that are out there. You'll also have to peel off the plastic black paper on most cartos unless you find a vendor that has the stainless steel. I use GooGone to clean any adhesive and then some Alcohol to wipe off the GooGone to clean it well before putting into your tank with liquid (GooGone would taste NASTY!).
You also can drill and use a spring punch to make a hole in the cartos if you don't have a Dremel. Some people are just using a large sharp nail to put the intake hole in the cartos. There are several videos and places on the forum that discuss various methods of getting holes for liquid intake in a carto. If I can do it, you can do it!
Using the Spark Plug, you'll have to have an adapter (901 to 510)
901/808D Battery to 510 Atomizer adapter in order to use the Boge 510 cartomizers.
I'm pretty sure you can use 901 cartomizers in the tanks designed for 510 cartomizers (they should be the same tube size)... ask the tank vendor (before you buy) if there are any issues with using 901 cartomizers! Then, you won't have to worry about adapters and can start vaping on your new tank right away!