I've recently taken delivery of a KSD 604 proto-J. I really wasn't happy with the pre-amp so shipped it out in favour of an EBS and it sounds soooo much nicer now. While it sounds great I have some concerns over build quality. I just have the impression that the bass itself is somehow a bit unsubstantial and flimsy. A loud sneeze while playing it and I'd be waiting for it to fall apart like a Buster Keaton jallopy. The only think I can truly point my finger at is that the knobs on the pots feel really plastic and lightweight and cheap and this has probably influenced my overall impression. What are other players' / owners' thoughts, particularly with reference to its ability to take a knock or two while gigging and still hold it all together?