I'm using firmware 1.01 with my rev.A DIR-825. No problems apparent.
Except that I can't run the router as it is advertised, printed right on the box. Roadblock one, the Shareport software is "To be used with Firmware 1.11 or higher." Roadblock two, the D-Link Mac Shareport forum shows that Shareport is usable to NO Mac users for sharing a hard drive.
I don't mind turning off DNS relay to make the newest firmware mostly usable (except for the unacceptable reported '30-90 second' daily disconnect). I think DNS relay and DHCP server is currently turned off on mine, allowing my Actiontec DSL modem to be the DHCP server. Each computer just has DNS entered individually.
As a Mac user, Shareport is absolutely useless, maybe unless you're using an old MacOS version, as spelled out clearly in D-Link's Mac Shareport forum. But even if I was a PC user, I can't use Shareport, to attach a hard drive to my DIR-825, unless I am willing to allow a 30-90 second disconnect from the net once or twice a day with firmware version 1.11 or higher? I've got to ask, really?
On the off chance anyone from D-Link reads these, I have been and will be checking back every few months waiting for new firmware from D-Link, with a slowly growing sense of disgust.
If you're one of the smart but subjugated engineers working for D-Link, please let me know what little steps I can take to convince the corporate suits to devote resources to making a better firmware version. (And a version of Shareport for Mac that'll work.)