I can’t really guess on the novelty, since that depends a lot on who you are and what you like to do. We hear from quite a few people who have been using theirs regularly for years, but we’d also guess that many of them just live on a lonely shelf somewhere.
The EggBot Pro is faster to set up for different types of objects, and is a little more pleasant to use– both in how it feels overall (solid aluminum is really nice!) and the fact that there is better visibility from the front side. However, there is very little (if any) real performance difference between the two, in terms of what speed and output quality you can expect. Both the Deluxe and Pro have “top of the line” performance.