The Beta's sound different but not better than the Tang Band W8-1808's. The flexibility of using the same H-frames allows me to change out just the tops and I expect to go back and forth between the Betas and Tang Bands.
I'll be building another pair of H-frames to stack or to use in my garage as I have an extra pair of Alphas.
The Betsy's I have use an early run of hemp cones ( per WB Labs info ) and although they lack the big sound of the Beta's my enthusiasm for them has not waned in the least. The folding wing Betsy's hooked me on OB's and I'm forever grateful for them and the Darkstar odyssey.