You know it may just come down to tastes, if you don't like the range of FM sounds of those synths I don't know that I could change your mind - I think they can sound really cool, personally, especially as a starting point for further sound design. Very unique attack characters possible, interactions that are easy with this style of FM synthesis. Some of the behaviors that result from how the operators work in the algorithms really feels fun to work with for me. Here's a track I did earlier this year that used a DX7 related synth as a major component of the synth sound (RYM2612, emulating the YM2612 4-op/6-channel synth chip, also emulating its hardware choices & flaws that sound cool). I'm not saying it'll make you a believer, but it's not pianos and bells (although it also does a handful of brief bell accents in the track, and also a motor sound effect):
https://soundcloud.com/user-612970086/s ... 7d46ebec16
Anyway - as a fan of the style of synths and user of the aforementioned one already I am very
pleased with Plogue's OPS7! Nabbed it, along with their super cool Chipsynth SFC, in the Black Friday sale. It seems like it has what I love about the one I've used in terms of how the FM operators "work" in broad terms, but OPS7 goes deeper, with considerably more sophistication in creating sounds. Which is what I hoped for, and expected based on reading about it
I can tell I am going to really like this synth, going to use it in a track soon to really dig in. Well done, Plogue!