Yes purchased a Mark Bass HF104 on the basis of reviews and 800W power handling, also had a HR115 cab and a little Mk2 head.
After selling some Hartke and SWR cabs found the Mark Bass speakers as woolly, woofy with no punch and a lack of clarity.
So got rid of both Mark Bass cabs and found a second hand SWR Golight 4x10 which was way better, also the Gallien Krueger cabs are fab having borrowed a small 112 combo amp.
The head although having a few options for sound does not compare favourably with my old Gallien Kreuger RB1001 head or my Eden WT550 for a clear crisp sound.
Personally I think Mark Bass is over rated and overpriced.
If you have the dosh buy Aguilar, Darkglass, Gallien Krueger and even some of the Hartke gear is very good.