Those things do look very nice, from what I can see. I do like the look of the veneer baffle with the grills off! Bill and Bill Jr. are the nicest guys, I've spoken with them on several occasions and we had wonderful discussions of their dealings with Infinity and Arnie Nudell "back in the day". (Bill Jr. said that he wanted to "punch Arnie right in the nose." ) Which caps are in your QLS-1? If they are the big "coke cans" they're probably OK, they seem to last. But my QLS had bundles of 200uF caps and they were all swollen and cracked and leaking, my woofers were flopping around like a fish on the deck. The only real way to know is to use a high quality ESR meter and test them at a similar frequency as the ones that they pass, I used 120 Hz. Since I had the original crossovers and changed the leaky caps to the second crossover version (swapping the 1600uF for an 1100uF), I changed the coils to the newer values like in your QLS. When I measured the original coils they were pretty far out of spec, you might want to at least measure them if you are going to all the trouble of replacing the caps and resistors.