I tried a Tonematch, and found it worked great, but not any better for my purposes than a $150. mixer.
If you work several various venues than require different e.q.s, or work with different makeup of band members, then the Tonematch would be good to save the "Scenes". One push recalls everything just the way you had it last time.
I once had a big 'ol Yamaha high-dollar mixer with automated sliders than did that. It was overpriced too!
DonM