I recently inquired about an item listed on their web site, by email. After sending reminder I got a response back that the item is no longer available. That was a week ago, and it's still listed in their current inventory. I ended up getting the same item brand new for not much more.
Their prices seem pretty high for accessories. An upsell tactic? They want $199 for a 1-2-3 P67 extension tube set. I bought the same from KEH for $149 with a bag (LN). Adorama asked $135 for the same IIRC, but it turned out they had accidentally mislabeled a set of outer tubes and I wanted the inner bayo ones. MPEX's asking prices vary from reasonable, to slightly inflated, to just plain out of touch. You know if KEH beats you price, you're high!