I too have a Mackie branded UAD-1, and I used it for a long long time.
When UA announced the end of the line for the UAD-1 I was a bit bummed. I had kept it, along side a UAD-2, primarily for access to Nigel, and a few more DSP cycles<G>.
But I am going to take the flip side of the argument... I think UA handled the whole matter with about as much class and concern for the existing customers as they possibly could. I don't thing they sold anyone short...
You were provided with two options:
1) since no future plugins would work on a UAD-1 you could 'freeze' your system at rev 6.1 and continue to use your UAD-1. It would not matter that you couldn't upgrade the software - heck, in some ways that's a bonus, you don't have to upgrade your software!
2) you could trade in your UAD-1 on a UAD-2. I don't remember the numbers, but it was a very good deal! I now have two UAD-2/solo cards (couldn't afford to go any bigger unfortunately). I miss Nigel, and I really do hope they bring back the algorithms some day, but I get a lot of processing out of my current cards.
There is one group of users that got caught in the crossfire - if you had a mixed system (as I did) you couldn't keep the UAD-1 and keep updating the software. That is unfortunate.
They laid out their business case for discontinuing support for the UAD-1 in future updates. You can question the wisdom if you like, but we don't get to tell them how to do business. Ultimately they had to make a call, and they did.
Someone mentioned that perhaps more UAD-1 users should have complained when the announcement came out. I read an interview somewhere with someone from UA (Tape-Op maybe?) and they were quite shocked at the volume of complaints that came in.
They just could not justify continuing to support software development for the older architecture. It was PCI based (although the did have a PCIe version I think), and it used a really archaic GPU for DSP. Porting all of that over to the two 64 bit architectures they support at the driver level was just too much.
So they offered to take the cards back... I think that was a good move on their part, and fair to all concerned.