Interesting thread - I purchased a BS5 and w/i a couple of months they announced the matrix. I have had buyers remorse ever since thinking I should have waited for the matrix (due to all the great reviews). Based on some your experiences with the matrix I'm a little happier about having my BS5.
This summer I bought a carbon venture (??) safari system blind to leave out in the woods as I was worried about theft. Not only was it noisier setting up but the first time packing it out a couple of weeks ago the backpack straps ripped out of the carry case, the Velcro windows sucked, and it is a lot heavier than my BS5. I should have saved the money and bought another DB.