dude, you are really an expert with skimmers. I always thought that H&S and Deltec manufactures their needlewheels from the same company, thus its the same. For estactic purpose, Deltec looks better than H&S.
What i really like about Deltec is the twist and lock collection cup, which made it super easy for maintenance.
Btw do you encounter any problems trying to remover the collection cup of the ATI BM?