I have used Quick Books Premier and Pro. I now have QBs Pro 2002, 2003 and 2004. It seems to get better and better.
The best features I enjoy are in the '03 and '04 versions:
I can email right out of QBs, my customers their invoices. (Great for those drop ships! No added expense for postage.)
I can fax right out of QBs, my purchase orders to my vendors. (Perfect for when I am on vacation or a business trip.)
It keeps track of my inventory for me and can be set up to remind me when to reorder merchandise. <--
The ability to customize my forms to my liking has enabled me to create some very professional looking invoices, purchase orders, etc.
I am able to view reports on just about every aspect of my business in text or in graphs.
An accountant' s copy can be formed and sent electronically to my tax man.
Etc. etc., etc. (I could literally go on and on.)
I purchased each of my QBs Pro versions brand new from Best Buy and Sam' s Club for a little more than $100.00 each because of Intuit' s wonderful rebate and upgrade plans. (My first copy of QBs was about $68.00 and then the following years I qualified for the upgrade rebates!)