I picked up two such adapters and the Delta is fine. On the other hand, my 575-M6 isn't too thrilled with the concept, keeps going down a channel when I key up.When I bought my II+ I found that my Uniden 6-to-4 adapter didn't work correctly and had to order a President 6-to-4. At least, that's what I remember...
Also had to go in and open tweak the AM Mod. Didn't make the difference that I wanted, but it's better than before according to my mod meter.