I see no advantage to checking out with and optional account unles you sell digital downloads or gift certificates, something that would require your buyer to log in. In this case you would not want the other mod and stick with account checkout.
I can delete customers after I am finished shipping or anytime I feel like it. If a customer has log in information then you can not delete no matter how long it has been since they have ordered from you.............. maybe years before they return. Will they remember what email address and user name they used?
For me I will stick with craftzombies no account as it is just what I needed.
And yes, my sales have increased since removing the manditory account checkout.
Infact, I had planed on creating a 1 page Bill To, Ship To page but have been so busy with orders that I have not had the time. :yes:
Thanks again craftzombie and paulm :thumbsup:
Play with it long enough and you will break it.