I have one for my A600 project.
(kind of inspired by A600.de, I currently have the ACA 630, the A604 and a CompactFlash IDE drive in there. I plan to add a Subway and Indivision ECS

Personally I'm quite impressed by it. Installation went flawlessly and it is quite a bit faster than I expected for a 25Mhz 68030. Maybe it's due to ECS limiting you to 16 colours, but it
feels faster than my A1200 with Blizzard Mk IV.
(Note that it isn't actually faster according to benchmark tools like Sysinfo and AIBB, but it feels quite zippy

)
Boot up speeds are really quite high, Workbench flies and Elite II:Frontier is suddenly a lot more playable.
Last but not least, WHDLoad really seems to like this particular configuration (A600, 2MB chip & ACA 630) - it loads just about anything non-AGA. Much better than my A1200 with the Blizzard MK IV manages, strangely enough. Even the quit button works, which was a bit hit & miss before on my A1200

I'd say it's highly recommended!