I have a bunch of Kiwi Ears sets. I figured I could provide quick thoughts on the lot of them!
Dolce: Nice little 20$ set! Comfortable lovely shell but a terrible cable. Pleasant tuning but a muffled congested sound. Not surprising for the price.
Cadenza: Highly praised for good reason. Beautifully tuned. Spacious sound. Impactful bass, clear mids, bright detailed highs. If the separation was better these would be insanely good.
Forteza: Gorgeous shells. An awful harsh shouty mess of sound. Strong dynamic bass, and everything above that sounds unpleasant.
Singolo: The bass shelf from the resonator is interesting, but people are right that the fit is wonky. Pleasant but boring. Awful cable for the price.
Melody: Awesome bass, dipped mids, detailed but slightly zingy highs. Took me a while to find the right tips, but finally found a solid fit. My NiceHck F1 Pro has become my more used planar set, but I still break these out when I want something ultra warm.
Orchestra Lite: I ended up returning these but I had them for a few weeks. I think they sound fabulous. Detail for days and incredible isolation. Incredible got games. I only sent them back because they reminded me of my MagicOnes quite a bit. They've made me want a nice multi-BA at some point.
Quintets: God I love them so much. Razor sharp imaging, thumping bass, clear as a bell mids, beautifully extended and lively highs. I still use them all the time even though I bought a set of Monarch MK3s to basically fill in the few gaps that these have. SO good for games as well.
Happy to answer questions about any of these!