Nope, But I've use the Yamaha MT2X, which is an older version. The DBX noise reduction is excellent, the routing system is easy and flexible, it has a perfectly usable monitoring system. The direct outs from all four track also makes it easy to expand. You can start with getting a larger mixer, and then get better recording equipment later. In all the MT2X is an excellent 4-track.
The MT4X has a three-band EQ, the MT2X just has two, and the MT4X has two send/returns, where the MT2X had just one, so it's certainly not a worse machine. The MT2X had 6 inputs instead of the MT4X four, but I never had much use of that.