The wife and I have had the same luck with Boge Cartos, but we were putting up with it due to the great pricing of them over at MtBaker Vapor. We were getting some that the juice seemed to just pour straight though and out onto the table straight out of the box even with a toothpick in the center hole to make sure that was not the problem. Others loaded up fine but then would become really hard to draw, almost like it was clogged up. Some were like that out of the box and others got that way after just one or two uses. We use 65/35 light colored juices and the Boge LR XL's (although they did not EVER seem to hold the amount advertised). However on the almost rare occasion you found one that worked right, it was a great product and we could get lots of vapor, great flavor, and many uses out of it.
However we have finally had enough. I switched over to a Mini Vivi Nova about a month ago and love it. Tonight I talked the wife into trying a Kanger EVOD (based on the recommendation of others here...Thanks) so we will see how that goes when it comes in.