I just received one as a free gift with my order today

Strangely, I was thinking of putting in an order for them after seeing this thread. Well, I took it out of the package, screwed it on and started vaping immediately. I have to say it is strange to be using my 510 without some juice somewhere. New carts always seem to have juice on the outside. My carts are also sensitive to how hard I draw. Too hard and juice usually comes out. Also, too hard and little vapor.
With this carto I didn't have any of the usual 510 issues. With an auto battery it is just like a smaller kr808. I was starting to stock up on the Dealextreme cheapo disposables, but this is just as discrete. It also lets me use my stock of unused 510 batteries since the kr8 is my main vape (I use my stock of 901 batts with the kr8 cartos.) You should be aware that the cartridge is a little smaller than the battery by a smidgeon, which is the reverse of most e-cigs.
I have been semi-chain vaping for about 30 minutes and taste and vapor have been the same. I would have had to adjust the filler once or twice and top off a regular 510 cart 3 or 4 times by now. I am looking forward to using the CCFM (
http://www.e-cigarette-forum.com/forum/tips-tricks/67012-refill-cartomizers-quick-easy-video.html) to try this with some of my bacon with french toast liquid.
(WARNING: CCFM SOAKS LIQUID INTO THE FOAM!)
I almost forgot: the softness aspect. I have always disliked the round hard plastic tips on e-cigs. I always use whistle tips on my 901 and 510 because I don't even like the shared ones and one of the main attractions of the 801 was the soft whistle tip. What do I think of these 510 cartos? They feel really good. The don't flatten like an analog, but they are soft like an analog. I could never hang an analog from my lips because the tip smoke bothered me. With whistle tip ecigs I am able to hold them in my teeth or lips so that I can type. This 510 carto is even better because it hangs from my lips without my having to grip them tightly with my lips. The paper surface, foam and lighter battery make it easy to do. And the paper doesn't stick to my lips like an analog would occasionally do when I was dehydrated.
I will definitely be ordering more of these...