I just got my Intellivision (and Colecovision) Flashbacks upgraded to the Ultimate through Byte Knight. And all I can say is... WOW!
This is FAR better than what the Flashback should have been. It's like the "Sharper Image" or "Brookstone" editions would have been.
Easy to use. Plug N Play.
The colors are perfect, sound is great and game play is smooth.
If you haven't already upgraded your Flashback to the Ultimate through Byte Knight, I encourage you to do so! You won't be disappointed!
(Now to convince myself that it's any Saturday in 1983, get a large pepperoni pizza, a 2 liter of Coke, plug in the Ultimate Intellivision and play the day away...)