What does Network Solutions do well? I have yet to have a positive experience with NetSol.
What does Network Solutions not do well? Pricing is abnormally high and attempting to remove (transfer out) a domain can be nearly impossible. Once in particular I was handling a very high value domain transaction for a client, and NetSol locked the domain indefinitely. I had to create a dummy account for my client just to get them the domain, and it almost blew the six figure deal.
What do you wish you had known about Network Solutions before using? I had known much of the 'bad' but when push came to shove, the inability for their customer service team to assist was the death knell for me. The fact that they are trained to make it as impossible to extract your domains from their control as possible says it all.
Have you used a competitor to Network Solutions? If so, how does it compare? Yes, literally every other registrar is better. Every. Single. One.