[USR-TC] To upgrade or not to upgrade

I was getting ready to upgrade the software on our TC but all this talk about downgrading is making me reconsider. We're just about to do the following upgrades: HiperNMC: from 6.2.17 to 8.6.3 HiperArc: from 2.3.32 to 5.3.2 HiperDSP: from 2.1.19 to 2.1.9, and then to 3.1.7 Should I postpone this upgrade? Are alot of people having problems with these code levels? Are there other code combinations that are "safer"? Seth