The 12 inch front firing speaker in the 1210 and 1212 is much heftier a speaker than the 10, at least in my cabinets. Did you try out the 1010 at a store or a live gig? Could you please tell us what head you were using and if you may have either on the bass or on the head used some fairly extreme bottom boost settings?
What did you end up buying by the way? Did you get a chance to try out any other sized Schroes or just the 1010? I don't know what the success/satisfaction levels are let alone even how many of the 1010's ended up being sold.
The 1210, 1212, or larger cabs seem to be the vast majority of purchases and have pretty much had a 90+% "happy to estatic" rating on the reviews turned in. Of course not everyone who was unhappy wrote up some sort of review but of the, I'm guessing 30+ of us posters that sorta monopolize the Megathread nowadays, I think there was only a couple that didn't like the sound. This is the first I've heard of the B string not being handled well so I'm wondering whether it's just because of the front loaded 10 not being hefty enough, a bad speaker or defective crossover, which doesn't happen often but can happen, or maybe there was not enough headroom, preamp overdrive created by extra bottom boost from the bass, or an weak battery in the Zon? (I"m fishin' here, just listing the typical stuff my technician would ask me if I brought in my rig with this problem) and whether others have had this issue.
I'm sure Jorg would like to know as we would, about as much of the above details of your B string issue with the 1010 as you'd be willing to share. He and the happy Schroederites really DO UNDERSTAND that these cabinets are not gonna fit everyone's taste, circumstances, style, and/or needs tonewise or otherwise.
Good luck and sorry it didn't work out for you.
Lkaye