I use the eGo tank system and have zero problems with leaking. The trick is to use a soft, slow drag because hard, fast drags pull more juice through the wick than the atty can handle, leading to eventual leaking. Some people never seem to get the hang of dragging that way or just want to be able to do hard, fast drags as with analogs, so the eGo tanks aren't a good match for them. That doesn't mean that the eGo tank system is somehow fatally flawed, just that like every other vaping system out there, it doesn't necessarily match up with everyone's needs. I tried Boge LR cartos after constantly seeing them being recommended and found the need to frequently top them off to be very fiddly and annoying compared to the eGo tanks. Even worse, they were a harsh, unpleasant vape
for me. Clearly some people like or need a hot, harsh hit that curls their chest hairs, but apparently I'm not one of them. Anyway, my point here is that there is no one-size-fits-all vaping system out there nor does hotter necessarily equal better, so it would be helpful if people would inquire a bit into what a new user actually likes before automatically recommending the LR and/or HV combo that they like.
... how often should i change the cartridge after filling up? And would i have to change it when i want to try a different eliquid, i'm assuming i can just take it out and give it a rinse under the tap, is that ok?
The tanks last a very long time (months) with normal use. For sanitary reasons I soak them in vodka (you can also use PGA or isopropyl alcohol) for about 5 mins once a week then rinse them off with hot tap water. For changing juices, you can just pop the bottom cap off and rinse it out with hot water.