Hi Bob,
might be a wrong message to the customer ;-)
The 8.10 version behaves the same and better compared to the 8.0 version. And if you install the hotfixes, than 8.10 and even 8.01 is working. OK, you need to know which hotfixes to apply, but this a different topic...
So, from my experience, DP 8.10 and 8.01 can be used. When planning for upgrades to version 8.XX, you should consider some additional time to prepare the old database in order to run a successfull migration. This includes purging and clearing out old errors and must include defragmentation of IDB using writedb/readdb.
Best regards
Daniel