Physical comparisons - smaller than the Rudolf Meinl RM-45 CC and the Yamaha YCB-861, bigger than the MW2145. I think it looks a little smaller than the piston MW 2155, but sounds about the same size out front. I think it might be about the same size as the HB-2.
Sound comparisons - they put out as much sound as the RM-45 or YCB-861, I think, but it's a generally brighter tone. I think they project better than the YCB-861. I know they project better than the HB-2. I've heard people play 188s next to HB-2s and the 188s always come out ahead. The 188 sounds fuller & more colorful.
Flame away, but I hear what I hear.

-ck