We have tried to support our local (Swindon) HMV and have had a couple of trips up to Oxford Street too. However although they dropped the traditional markup on stuff they used to sell, the selection was not always that good - little bit of everything not a lot of anything. The London store was particularly diminished compared to years gone by, very cramped and stock all arranged randomly no real order.
Both the missus and I are really into 4K disc format and as HMV the only reliable High Street location it will be a blow if they go. The supermarkets aren't really interested in 4K, they would much rather just pile up lo-res DVD's and sell them at a cut price. If it's not in the Top 20 or the latest "Now" drivel, forget buying a CD in Tesco or Sainsburys etc., too.