Finally got around to posting this...
I stepped out of WS briefly (knocked the 64DD off my bucket list), but I'm back in a big way. I still can't believe how cheap I got those Wonderswans for. $35 shipped, seriously. That includes the SwanCrystal. They all work, even the beat up B&W system. I also treated myself to a WS Flash Masta. Man does that thing ever improve the Wonderswan, now I can actually play games I'm interested in! I bought a CIB GunPey because it's my favorite WS game.
After having used a SwanCrystal, I'm actually perfectly fine with the Color. I know, unbelievable. Thing is, although the Crystal has a very nice screen, I find it a bit too dark, the contrast is low. The speaker is also kinda tinny and quiet. Maybe it's just my unit, perhaps it needs fixing? The two Color systems I got are in amazing condition, the screens have no functional wear on them at all.
That said, the slight motion blur on the Color does make games like Judgement Silversword harder to play, so the Crystal has that definitely going for it.