They are not much smaller than the regular 4x10 even though all of the 10s aren't front-facing, but they do seem to be lighter even without using neo speakers. The measurements are 23x23x16 and 78 lbs. Compare that with some other cabinets:
Eden 410T: 23x23x18.5, 90 lbs
Eden 410XLT: 23x27.5x18.5, 98 lbs
Eden 410XST: 23x25x18.5, 95 lbs
Aguilar GS410: 28.25x22.50x16.625, 98 lbs
Aguilar S410: 24x22.50x16.625, 83 lbs
So it's in the ballpark. Power wise, I am told that while they can handle a lot of power, they are also pretty efficient and don't necessarily require that much power. I suppose it depends on how loud you want to go.
The Schroeder site is at
http://www.schroedercabinets.com and has limited information. On the other hand, there's a thread over at Talkbass discussing these cabinets that has over 1000 posts on it. It's at
http://www.talkbass.com/forum/showthread.php?t=133045. One key claim from the thread is that these cabinets sound much bigger than they are. The claim is that a 4x10 can replace a stack, and the smaller 1210 (23x16x16, 47 lbs) can replace a 4x10. Another is that these cabinets project very clearly.
I am seriously considering either a 1210 or a 1212 to pair with my Super Redhead as an extension cabinet (both are 4 ohm) to add some more low end. That will feed the cabinet 225 watts, and I am told that it's enough to make it sing. On the other hand, I am also considering a Stewart World 2.1 power amp and doing away with the Super Redhead all together. He has frequency response curves for the individual speaker components and the 12 looks stronger all the way across the range compared to the 10. Unfortunately, there's no similar spec sheet for the cabinets.
With all the hoopla at the Talkbass site, I was hoping that some of our Alembic users would actually have tried these things to give a hands-on report, but it hasn't seemed like it so far.