I'm not having the problems that some people are.........yet. Been using my DSE601 for almost 2 months. According to Hoyle, I should be starting to see a degradation in it's functions, but I'm not............yet. No sticky switch, no wet bowl. I did have wet bowl issues at first when I was using a very thin juice (SS Choice menthol), but now all I notice is that the battery is a little damp when I put in a fresh battery. But no leaking into my pocket or anything.
I stated using the blue foam cart filler from Strictly E Juice today, and so far, every hit has been full. No thin hits at all. Maybe there's something to this blue foam filler. It seems to wick the juice really good. I do use juice that has some VG in it, so it's thicker than PG juice and that may be solving the wet bowl issue. Maybe I got lucky and got a good unit. I bought mine from ARLO Electric Smoking Products.
I went to Heaven Gates.com to buy the Ruyan last night and they didn't have any in stock. I found two at other sites, but they were both more expensive than the $160 for the Ruyan at HeavenGates.com. So I'm waiting till they get some more in stock.
Ed.