I used the GMG Oris, and the EFI, and they both do the job I need. The Oris is a pro volume RIP, and the EFI is a pain in the rear to deal with, but does a decent job. But I am changing printers and I have to pay lots for upgrades, so looking for a alternate solution. I too have a spectro and swatches, but if I can afford it, I would take the RIP over 2-3 days of testing re- linearization etc. But lately the well is dry, so we will see :-)
Both also SWOP certified contract proofers.