I have the Markbass 106 which is a 6x10 sealed cab with optional horn (can be turned on or off). Not the ported one with the yellow speakers.
It has great tilt back wheels, and easy to move around as it has the carry/push bar on too (helps wheeling).
It goes ridiculously loud. Ive only ever put around 50% of 400w into it, both indoor and outdoor gigs.
Its probably the perfect height where you can rest your amp on top and any set lists and theyre at a good reading height.
Its a 6ohm cab, which if using solid state or class d you kind of get the best of both worlds, with your amp giving a bit more power than it would into an 8ohm cab, but not running flat out at 4ohm.
This cab is also only 34kg! Which makes it pretty much lighter than a lot of 4x10s. It feels like nothing to wheel around - due to its height (ie no stooping to push a 4x10) and quality wheels, and is fairly easy to hoik up onto a stage if needed. Just remember stairs are a completely no no really, unless you have help.
Only thing i'll say (and im still twiddling with the sound) is that the sound changes dramatically the louder you go. Pretty much from a nice smooth bass rich funk sound to trebely ampeg tones just by increasing the volume. I presume thats the effect of x6 10inch speakers coming into play?