Well, your mileage may vary. The V3 Rumbles seem to have gotten good reviews, and the videos I've seen they sounded good. A good rule of thumb is that if the head is sold separately but also exists in combos those combos may be higher quality than a typical practice amp, so I get that.
But I thought the V1's sounded pretty terrible and looked to be built pretty cheaply. Old Peavey TKOs and TNTs were more sturdy and better sounding, for cheaper.
Similiarly, I thought the V1 BA Ampeg series were muddy and dark, not impressed. V2 sounds OK, Portaflex better, and there's nothing compared to a V-4B stack in my eyes. So again...it will depend on the brand and certainly what market they are targeting with any given design.