I have all Viking and i love all of them, especially my Sapphire 875 it sews like a fairy to me and it has many many (enough for me) stitches that i would probably never use all. It is also great for free motion which i haven't used because i bought the viking long arm, which i am starting to get familiar with and loving it.
I know for people who wants to have a long arm for business look for certain brands, which are considered commercial i guess, but for me my viking long arm does the job very very well and the robot (quiltsewclever) just adds to the sweetness. IMHO