Well, after much deliberation as to what to get, I picked this one. After adding my old Trace Elliot GP7SM's 15" as an extension to my Markbass 121H combo this weekend, I think I'm headed towards a dual 115 rig with a Little Mark III. I have pined away over all the 210s, 212s, and various combinations enough already. I am so used to 15s in the past anyway. But, I'll have time to decide what to add later as I save up for the next piece. The Trace 15" sounded nice with the 121 combo. I didn't notice any phase issues, although they may have been there. Turns out the part of the Trace combo that only houses the speaker is about the same size as the Markbass 151P cab, only not quite as deep. I dunno, but I'm hoping that gives me some idea of what I'll get from the Markbass speaker. Can't find enough reviews of the 151P cab. One guy said he hated it, but more folks said it was good for them. I've also heard that the 151HR has more botom, but it weighs more than I wanna haul. See, that was one of my points in picking this cab. I may have to give up some bottom in order to have a cab I don't mind hauling. Two of them, though, might really sound good with the LMIII. However, it will take some time to save up for the second cab and separate amp. Hey, but I have four gigs in June, and six in July. I'm looking forward to it arriving, and I'll be sure to give a report on it. In the meantime, anyone have any comments on the cab? I appreciate it. Thanks in advance.