Cloudlayer is totally a different concern. The problem was on Softlayer's cloudlayer software, not the network or bandwidth. All of them are A+ quality provider in hardware and bandwidth quality. Though, the management level differs between couple of them. But that doesn't effect overall performance. It is all the pricing and your requirement which would met whom you are willing to go with.As far i heard, cloudlayer*** hosting of Softlayer is too much bad.
*** I don't know what it is. I saw a topic on WHT about review of Softlayer.