I'm going to replace the input resistors with these next. I'd love to do the whole board but these lose quality over certain values that are too high (a few are too high on the Bugle). Plus it'd start to add up. But I'm going to use these on the input too my amplifier as well. I just hear such good things about them spanking everything else. But even so I've been very happy with the Caddocks. My big complaint is that now I can hear how much I need to do some modifications to my turntable! http://www.buildanamp.com/Resistor-Replacer-RR.htm
I also recently cut off all the plastic from the capacitors on both boards. I'm not sure how much it did, but it may of made a softer sound. I sort of just use a pocket knife and move it up and down to slice the length wise, then cut the top and bottom remaining parts with the tip. After that it just tanks a yank while holding the capacitor still.
Either way I've been playing my laptop at super low volumes (mechanical and software) through the Bugle while it is off, in order to burn in the capacitors. They really start to sound sweeter after some burn in; so you got something to look forward too.
The one thing that makes my unit also separate itself a lot from others is that it is backed by an amazing power conditioner!
Have you compared yours to other units? I'm not convinced that with the simple improvement on parts you can find anything nearly as good for any sort of remotely comparable price range. You'd have to double the price to get close. The Bugles big downfall would be noise, distortion, coming in from the power since it has nothing to reject it in the most basic of basic designs. It is an extremely pure design if you look at the simplicity. It sort of banks on the theory of power being distinct and clean. When used with batteries that is true, but I prefer active power.