Thousands of pounds have gone the way of Bass Direct from me over the past 5 or 6 years, almost always Mark has dealt with me personally when I have came in with a handshake and a chat, can't ask for more really. He is opinionated and he has his own views, but I like that about him. Plenty of shop owners could just let you buy something that would clearly be unsuitable. Sure, he wont always be right, but ultimately its your choice to ignore his recommendation if you wanted to!
By contrast, a couple (not all) of his members of staff I have dealt with when he hasn't been in shop did seem pretty disinterested nor keen to talk bass, which is a shame.