I'm anxious to try the RBA out, myself. I'm just waiting until it's time to switch out the BVC that's presently in the Mini. I figured that for the price of 2 packs of the BVC coils, I'd order 2 of the RBAs and take a gamble. I decided I wasn't going to try and stock up on the BVC coils. As much as I like the Mini, trying to stock up for the long term is pointless. I have my fingers crossed that I can make the RBAs work at a satisfactory level.
I concentrated my efforts on 3 rebuildable tanks that work well for me presently. The Tron-S mentioned above, with the CLR coils, the EHpro Kayfun Lite V2, and the Subtank Mini with the RBA. The Tron & the Kayfun are working really well for me. They both hit my MTL sweet spot. I recounted my CLR stock, and I have 9 packs. That's 45 mini RBAs, the way I look at it..lol. Since I've been on the same one for 5 months, they should last longer than I will. I pick up a few packs here and there, when I saw them on sale.
The Kayfun was a little tight, air-wise, for me. So I drilled out the air tube on 4 of them, and it's perfect now. I have 4 more that are still stock.
The STM is a little airy for me, even on the small air hole setting. I saw someone selling replacement air tubes for it, that were a smaller diameter, somewhere. I'll have to find that vendor again, and get some, if the price isn't too high. If I can't get those, I'll come up with some other solution to tighten it up. Even though the STM isn't perfect on the draw for me, it's such a workhorse, and I have some spare parts for it, I will make it work.
I told @Alisa I'd let her know how the Kabuki RBA's worked out, in another thread, also. Hopefully I'll have a verdict soon!