Been vaping for about a week with the Riva 510 and like it. Been using the drip tip which is cool but not very practical at work or driving. The carts are OK but only seem to last for about 2 analogs worth of vaping befor having to refill. What i am looking for is something that lasts alot longer. Are there long lasting,big capacity cartos out there? Would be nice if i could just throw a couple cartos in my pocket and be good for all day.