Oh, boy, where do I start...
The bottom line - it is NOT hard and everything works, BUT:
1. be careful with URS strategies and make sure you backup ALL of your CME, because for some inane reason when you restart URS, it sometimes messes up and loads OLD strategy that you have long unloaded.
2. URS 7.2 is compatible with 6.5 and 7.x strategies but backup your strategies (you will be thankful that you did)
3. if you plan on continuing using 6.5 strategies, DO NOT recompile them in 7.2 - use 6.5 IRD to modify them. I strongly suggest re-designing them from scratch using IRD 7, since it has many features we did not know even existed in 6.5 and you need to take them into account.
4. Statserver 7.2 is really awesome compared to 6.5, BUT some of the stat definitions have changed so check twice the stat definitions in options.
5. URS targetting is different (at least when you use VAGs) and so be prepared for complaints from SVs that calls are not distributed in the same way as before.
6. DataSourcer 7.x disconnects from StatServer and does not notice it even when use addp, so be careful!
Altogether, I STRONGLY suggest the upgrade - there are tweaks and cheats here and there, but overall, you would notice a much lighter CPU load on StatServer plus much better URS performance.
And, yes, ghost-calls are a thing of a past!
I will write more a bit later!
Best regards,
Vic