I got a pair of the Caldera Closed Thick Lambskin Top Perf Only pads (CCT for short going forward) and really like what they're doing with the CC. I was previously splitting time between the stock hybrid pads and the thick lamb top and side perf pads. The CCT pads are listed on the website as the warmest pad for the CC, and my ears definitely concur. I notice a subtle lift of the subbass, but much more significant lift of the midbass with the CCT pads. I always thought the bass on the CC was well done, tight and impactful, but lacking the weight of the AC or Atticus. The CCT pads bring it much closer to those bassy models. It's still fast, tight, and impactful. But there seems to be an added decay/linger, that allows for the impression of more weight and heft. I still think the AC and Atticus are still weightier sounding, but the gap is smaller. Mids other than the bass seem pretty similar. I had no complaints with the older pads, and the CCT are every bit as good. Once you get to the upper mids/treble though I do notice a slight increase in transient attack, making them sound slightly harsher. When listening to the first track with the CCT pads I kept going back and forth with this and the bass. I kept noting how nice the bass was with the new pads, but also how energetic the top end was. I run the red mesh, FYI. I wouldn't say the highs are harsh outright, just not as smooth as the older pads. All in all i'm a huge fan of the CCT pads. I doubt i'll pad roll much any more. Oh one more thing to add last minute. The CCT pads give you a slightly more intimate stage. It's not closed off sounding, just not as large as the other pads. I personally like that, if the stage is too big it starts to lose musicality to me.