There's nothing wrong with greys, they are a perfectly fine injector, though as said production will NOT be resumed on these.
The greys or 0 280 150 403 are still about, though not many new ones it has to be said.
There are 3(three) in the UK, and 1000 in Germany today.
It's certainly not worth swapping just for the sake of it, but obviously if buying new then I personally would go for an alternative to the greys, but up to each to decide, not sure which ones I'd go for make wise.
tabetha