I know there are already a couple of posts on this topic, but I thought I'd open one myself to share with you my experiences with this particular movement.
Its been a couple of months now since I ordered my first watch with the new 7750 28 800 movement. It was the new Tag Liink Chrono (Aerton Senna). This was the black version which I sold to a friend.
A week or so later I bought two more Tag Link Chronos. One black and one blue. One for my boss ( ) and one for me.
Then a week or so after that I bought an Omega SMP Chrono and an IWC Portuguese, both with the new 7750 also.
And soon after, trouble arrived. First, my boss' Link broke. Just wouldn't work at all. Tried winding etc, but it just 'slipped'. Then the SMP broke. Same problem as the Link.
Now, my second Link has also broken. Well, the watch is still running, but the stopwatch won't reset.
And today the IWC also broke. Same problem as the two first. Just wont run at all.
So, the only watch with the new 7750 which is still working is the first Link I bought, which I sold to a friend of mine.
And, just to make these events even more perfect. The two watches which I have sent back to my dealer have disappeared in the mail, and they will only compensate $80 for the loss if they aren't found.
Now how great is that?
/Thor