I have this ... bought it a while ago out of curiosity. AFAICT, it's a limiter with a selection of EQ presets. As a limiter, it wouldn't be my first choice, lacking basic controls like release time. But it seems to do a decent job.
Occasionally I've slapped it on a bus or mix just to see what it would do. Once or twice, I liked the effect after switching among the 4 or 5 EQ settings.
Is it worth ten bucks or so? Maybe. I wouldn't go out of my way to hunt it down if it ever went missing, though.
Cheers,
Eddie