Although I do love my A3000 (looks cooler than an A4000!), it does have it's shortcomings.
I do miss the AGA chipset for those games that need it, plus I dont use the internal scandoubler anymore since I have a Picasso IV (but when I did use it it was great feature). Plus there's something I always missed: an internal cd-rom (call me weird, although my external CDRW works great).
There are of course it's pluses: Way nicer than an A4k (IMHO), all chips socketed (that's not standard on an A4k), can run AMIX out of the box, good and reliable scsi, SUN wanted it to be a low-cost UNIX box, etc.
My .2 euros ;-)