EM 510 because they are Eastmall 510's.
My understanding is that David, at Eastmall, has them made to his specifications.
I think you will confuse people when you put up the Riva 510 atty's. They will wonder who made them, what are the specs, will they fit other 510 pv's, etc. Other suppliers list EM 510 atty's on their websites and they are listed as EM atty's.
Eastmall has a decent reputation and seems to put out a good product. They have had some atty problems in the past, but those problems have been resolved. Have not heard any negative reports coming on the EM atty's for awhile.
I have used EM atty's and I like them. They are little work horses and you can't beat the prices. But you need to order in quantity when you order from EM. I would prefer to keep my business with my main equipment supplier (Liberty Flights USA). I prefer the customer service at LF, and the very much appreciate the communication we receive from LF ownership and management. But, that is just me.
Meantime, I am going to place an order for the Joye 510 attys. We gave our daughter one of your Riva 510 kits for x-mas and she has been hitting my supply drawer. Some of my 'stuff' seems to be located at her house now - LOL. I don't care. Whatever it takes to get her off cigs. She has been smoke free since 1-1-11. We are doing the happy dance
That is my two cents.
Paula in Arizona