I'm one of the 100tb.com fans and about to purchase another server from them soon.
Are they still best in terms of 100TB bandwidth and price?
I had only one issue which was DDOS attack when I was running file hosting site with them.
Please let me know if you had any other bad experience with them lol
Some clients who use a lot of bandwidth get noticed by Softlayer's automated system which then null routes the IP making it unreachable. Not sure if it thinks the machine is launching attacks or what, but it is probably something you don't have to worry about.
A CDN(Content Distribution Network) is a bunch of servers working together to deliver content, and since you didn't know what it is you don't need to worry about it.
Although 100TB are resellers/partner, their support has been very fast for me. On average, they reply within 20 min and things get sorted within an hour. I've been with 100TB for almost a year and I'll post my review in a month or so