Honest opinion is don't go for the 2500 movement for a franken, sure they seem relatively cheap in some corners but if you want the feeling of a 2500 just go for a 2892 in it and you would be much better off in the long run. For starters, who is gonna service a 2500, not many people will be able to and you cut off one of the main advantages of a franken PO over time....cheap service/maintenance costs. Good franken PO's are an amazing watch, and this is coming from someone who has gen, franken, half franken and another rep
The only one issue that could've made franken PO's perfect is the tube job that needs to be done, if they could've made it truly 1:1 and allowed a gen tube to screw directly in instead of all the mucking about with epoxy or other methods, then it would've been outstanding.
Also no worries on the new PO reps, hopefully they are good, but they won't be frankenable (where are the parts gonna come from?) and regardless of how good they are on top, turning the watch over ends the illusion! The old PO can be made externally perfect!