Shareasale not only pays on time, and has good tools but Shareasale is also against any affiliates who use cookie stuffing, spyware or any other less than ethical way to earn a commission. This way each affiliate has an equal opportunity to earn fairly. Just remember that when you are looking at the merchants try to go with those that have auto-deposit on their fund, other wise if their funds go low they will pause their account and you then either have to pull their creatives down or get clicks or sales that you won't get paid on. Most of the larger merchants are on auto-deposit, but check just to be safe. I like Shareasale a lot!
Is share a sale correct. Yes that is correct, they do go by their name and share sales with you. They share them by giving you a commission for each sale that you get for their merchants. Well infact the merchants deposit money into their shareasale account so they pay you really. Your earnings get consolidated into one monthly check and then get paid to you. ShareASale is a very good and trusty network and I never hear people moaning about it, but always hear a lot of good stuff about them. There is a review/some quick information about ShareASale here just in case you wanted to see what it has to offer, when it pays, etc. Good luck on what ever you decide.
In my opinion Share a sell is one of the best US affiliate networks, so you won't be wrong to work with them