I can vouch for knowledgenet. We registered several engieers with knowledgenet and later found the same exact Cisco and vmware training for half the price through Skillproxy. Knowledgenet offered to match the price but ended up issuing a full refund as promised. Couldn't be happier with the training.

I received a call during the busy part of my day, I asked my receptionist to transfer him to my voicemail. Instead of leaving a message, he proceeds to tell another person that he knows I am there and then says what a douchebag. Very classless. Makes me believe the other negative information here.