I have tried just about every clearo on the market, and 3-4 popular RBAs, over the last 18 months. They all had their good/bad points, but I recently tried the GS-H2, and found it to tick all my boxes as a regular PV. It is good looking, light, never leaks juice - even when refilling, is easy to fill - even with a snub-nosed dropper, and above all it is CHEAP. I got some on Ebay in UK, in original boxes, 5 for £8, post free. I can't get regular replacement bottom coils for that price! I'm so delighted with them that I've just ordered another 20 so that I can fill several at a time and have them ever-ready. I even carry a spare in my pocket (no leaking!) in case I run out when away from home. The bottom-coils are standard, and a cinch to re-wire.
Perfect!
Oh, yes. I forgot to add that they use the Ego thread, not the troublesome fragile 510. One tip - when using for the first time, make sure the coil is screwed in tight. I found that several of mine were loose which tends to loosen even more when the battery is screwed in. This can result in a bad connection, and there is the possibility of getting leaks.