i've never bought any car from either TM or MUV, however they seem sincere about giving you better quality used cars.

they put it B&W everywhere got what limited and criteria of cars they accept to trade-in and sell. so maybe with that kind of guarantee you can say they'll be better than outside dealers that accept anything and of course dunno if they lie to you or not, if they do got no B&W to backup. besides nissan and toyota are behind these two so should be decent.

though i think the best is to go and survey their stockyard now and then, make friends with the SA, if they're friendly and helpful enough they'll point you to the best deals as all cars there are not equal eventhough they may look equal at first glance there are other things to take account for other than just a clean tidy exterior and interior like service manual to indicate it has been serviced regularly and on time, any accident case, the mileage, flood case, etc.

the typical SA will of course try to clear his stockyard asap no matter what, but if you able to tenderize his heart he'll probably intro you the fresh stock which usually is better than something sitting there for 3 months nobody wanna buy 

You should never take the sellers word as gospel, not matter what they are selling. You will have to check it physically yourselves. If you dont know how, get someone who does, either a friend or your trusted mechanic.