My friend told me horror stories about tanks and I read a lot of the forum posts, so I wasn't so sure I wanted that kind of trouble, but I couldn't stop thinking of how nice the tank would be cause it showed you when you needed to refill. I am apparently a visual person. So I started out with pre-filled cartos, which were nice, but then went right into Smileomizers. Thinking juice in something to refill and hold more then a carto would be cool. I ended up buying 11 Smileos for me and my better half to share. Well I didn't like the Smileos cause I was so concerned on them burning up. Plus I had to either drip fill and wait or use a syringe that I realized I didn't like to fill them. Of course using the syringe was easy peasy, but it was still something else I had to have around the house. But I didn't want to have to carry it with me in case I needed a fill or top off. So I decided to buy a couple tanks to try. Was a little worried because of the horror stories. But the day they came in I sat down and watched Snowdragon's video on how to fill them and with in 5 minutes I had them both filled up with no leaks and was puffing my little heart out.
Since then, I have passed all 11 Smileos to my friend and bought tanks. I have both 3.5ml and 6ml sizes in different colors. It takes me less then 20 seconds to refill a tank without needing any needles, special stuff, or any of that crazy drip and spin around crap!. And I have yet to have a burnt or over saturated problem with a carto or tank. I LOVE THEM! They were made for me
Granted, I may be one of the lucky ones, but even if I end up having a problem with a tank, I figure since I got more tanks sitting around, I will use one of them till I figure out the issue with the bad one. I am not in the least bit concerned. So I would recommend having more then one tank if you decide on the tank route, just so your not stuck with a single bad one and turn frustrated.
I would also recommend having an extra carto or two on hand so if one goes bad you can flip it quickly. I personally bought a few but have yet to need one. I have been using my tanks now for about 2-3 weeks I think.
Cleaning them seems to be easy for me also. I bought some cheap Vodka that I soak the cartos in. Then after awhile I rinse in hot water and let sit for a couple days to dry out. If I need them quickly, I put the carto in the oven @ 175 for about an hour. I also take the tanks themselves apart and soak the plastic pieces and end caps in hot soapy water for a little while then rinse in hot water and let sit for awhile to dry. If I need to put the tank back together quickly, I dry the pieces with a paper towel.
The only issue that I didn't realize at first was that the end caps of the tank that have the o-ring need to be a little wet to get them back together, if not they are almost impossible to get back in. I have also noticed when I put the end caps back in that some times the o-ring flattens out some and doesn't seat well, so I use a baby screwdriver to move the end cap back out a smidge then back in and it seats properly.
So for me, all in all, tanks are the way to go. The best thing about them IMO is being able to see when I need to refill.
Lovely little gadgets!