I've not had any issues with my STXII and the Burson's.

Greater depth. Clarity, bass, mids and highs are all improved greatly. Separation, imaging of the sound stage are improved dramatically. It's really like night and day, and worth it. I think there is a trial period for them, but I don't remember for sure.

I'm using the Burson Supreme op amps on my STX II. Awesome. https://www.bursonaudio.com/products/supreme-sound-opamp-v5/

I just got my Cable + and, with some befuddlement, got it working. Wow, is all I can say. The increase in sound quality and clarity is big. The cymbals sizzle into a slow fadeout, and I can push the bass up and it's deep and articulate. I am not a believer in special cables for stereo, however...

My opinion and experience go hands down to the Burson Supreme Op Amp V5. It's a huge leap in sound quality-pick an adjective-than any of the ic chips mentioned. I tried them all, obsessive tweaker that I can be! I don't have a horse in this rate, I just want to share my experience with you.

I'm a big fan of the Burson Supreme Op Amps.

They will sound pretty good. I tried them, too. I have a great deal of doubt about the Bursons burning out the sound cards, but then again, I'm no electronics wizard. My experience has been very good. -jim

My ears prefer the Burson Supreme Op Amps V5 above any chip. I've swapped out quite a few of the mentioned chips, but when I stumbled on the Burson's I found them to sound far better than the rest. Just my experience and opinion. -jim

You will be very pleasantly surprised and happy with the Bursons. I promise.

I love the Martin Logan ESL's. Clean, clear, airy. A subwoofer is recommended. Friends are astounded when they hear them, as was I. I have no regrets. Love 'em. The Audeze headphones, I can never say enough good things about them. I had the LCD-3's for two years and just upgraded to the LCD-4's...

I used the 1st version Bursons for a year or two in the old STX and the new version Bursons in the new STX II for almost two years now. Trouble free and clean clear audio.

I've used the Burson Op Amps both in the STX and now in the STX II, since it became available. I've never had a problem. There's a huge jump in sound quality with the Bursons, and I would highly recommend them. They are worth the price. The new version Bursons are also a big jump in sound...