I was planning to buy an rba and building but this is giving me a good hit for about a month now. I clean it every 2 days since it's coming to an end to its long productive life. I would think 2 more weeks and maybe cleaning it everyday with Qtips and rum or vodka whatever cheap stuff I got around will do it. Besides I see the rba is out of stock where I was planning to buy it, you know the CHEAP place. I'll buy a couple 5 packs of the X4s should last me until my next mod ... I guess.