I have a tendency to crack open every piece of new and used gear I get home . To see the workmanship (or lack thereof).I'm incredibly impressed with the Mesa Subway D-800 +, looks like a work of art in there. GK MB 800 very good, well put together..Fender Rumble 500 head ..a lot better than I though..I do the same to my cabs as well..and basses. I'm interested to know if anyone else does this ? Or only when a problem occurs?