We got the CMS600P2(VET) with 7.5 MHz linear probe - it is a little notebook style machine, very portable. Only time will tell whether it's worth it financially, but even having used it just the one day, we feel it was a great investment to help us along in the process of keeping track of how things are moving along inside our girls. Now we'll be able to track trends with eating and follicle development, and learn the ropes and rhythms a little better with less guesswork. Just the hard work of keeping the girls from wiggling all over the place while we try to get clear images!