I owned a pair of PFEs for a short time (just long enough to assess their sound) and was quite pleased with them. I had no cracking issue (I got mine in June of this last year). When I first got them, my only complaint was that they didn't have as much bass response as I'd have liked. Then, somebody pointed out that I could switch filters, which I did, and the bass was quite nice. There's definitely a tradeoff in either going for the HF or LF version of the sound signature. These are single-driver earphones, which will not have the SPL of their multi-driver rivals, but they are nicely balanced and the solution is simply to "crank 'em up." I'd rather have a balanced sound signature than a loud pair that sucked. You won't get top sizzle and maximum bass at the same time, which is the downside of a single-driver setup, but as single-driver designs are concerned, I have nothing but praised for the PFE. I also liked the fit. This is a small-shelled IEM, almost as diminutive as the Etymotics. I didn't think the tiny eartips would form a seal but, to my delight, they did all that and more. Because they fit deep into the ear canal (which narrows as it goes), they not only fit, but the seal was great.