The following are ok-not terrible but nowhere near good let alone great.
Worst vintage synth - OSCar. Somewhat thick but lacking in many ways that contradict the hype ("it's like a minimoog")-bereft of warmth, life or punch, after learning to program on one in the mid-80s. When i couldn't get good sounds out of it I wanted to ensure the issue wasn't me and my nascent programming skills. Thus I put it head-to-head with some vintage classics after tweaking them and then knew that the issue was the character of the sound.
CZ-101 aka "chee-zee 101". Without a doubt you can get some decent sounds out of it, but it's ponderous and tedious to program and does have a plastic, sterile character to it overall. Sure it's a bargain and gives some good value but what the hell i'd rather start with something better to begin with even if there's some appeal in coaxing something out of this.
Korg Mono/Poly - 4 oscillators is misleading. Character something like an OSCar - somewhat thick but lacks warmth, character or punch.