Unfortunately I have not tried PT10 yet, however they way they have handled its presentation thusfar has left me unimpressed and planning to stay on PT8 until they get their act together.
Not impressed by their marketing strategy, or lack of maintaining good solidarity from the get go. Somehow anyone who's got CPTK1 or 2 gets a "free-pass" to run it with PT10 at no extra charge, but if anyone missed out on upgrading their DVTK or MPTK to CPTK for $350 during PT9, we're all SOL and have to buy CPTK for a full $2000. Hopefully that's just a mistake in their store, but it's lack of a united front. And that they didn't mention support for the 002/003, but buried in their FAQ on their support page the mention support for those boxes and PT10 is the last version to officially support them. Had to dig around to discover in a fine-print note that CPTK is still required for all the "HD features" - they don't disclose this up front and delineate if you need it. Maybe so you buy the upgrade, realize you don't have the cool HD features, then realize you have to play them $2000 to pass go? So far it's all come across disorganized and shady to me.
And here's the funny part:
PT8 or lower to PT9 to PT10 = $550
PT8 or lower to PT10 = $500
Accounting error much? Another example of a lack of a united front.
Sorry for this being somewhat of a rant. Now I'm realizing why so many stages and facilities have held onto older versions for so long... it's such a mess to try to upgrade and maintain modular transparency in my opinion. Why Avid still doesn't get this is beyond me. The plugin vendors know whats up (see: Waves drastic new pricing), but Avid's still a space cadet.
In conclusion, my initial reaction to ProTools 10's release was this: "Avid, I'm taking away your final Man card"
EDIT: An email response from the Avid store did state that upgrade options fro DVTK 1, 2, and MPTK are coming. Good to hear that steps in the right direction are being made. Still a pretty bad PR mess on their part, but at least there's some progress.