I have used QuickCert/Specialized Solutions for the purchase of CEH312-50.
The online CBT seems OK. I say OK because I'd purchased the Preplogic DVD set beforehand and didn't seem to get on with this. In fact I still have it somewhere. I found large gaps in Preplogic's material. I then opted for QuickCert. Why buy someone else idea of the material when I could get EC's material at a resonable price.
The service is always available and I never had any connectivity issues nor did I have any issues whenever viewing the material. The explanations through the material seemed to be good enough.
I do have one problem however and this one you might not have. The only problem I have is that I purchased this material around a year ago. When you purchase it you're given online access to the material for a year. No problem here I thought - a year will be more than enough. You're also given free updates to any new material changes.
Then the courseware got updated from v4 to v5 and QuickCert have been slow in updating their content. I emailed them a couple of months ago and they said that even though EC has released theirs the online CBT wasn't ready. I've just emailed them again before coming back here.
I was about to ask if anyone here had a similar issue.
My concern is that my year will expire in March and with this in mind I'm full speed ahead going through the material. The problem is I'm flying through v4 of the material and looking through some of the differences in articles here there is a big enough difference in terms of new tools to concern me.
Would I use them again? I'll reserve judgement until I see how they deal with this issue I have. As far as getting what I expected to get when I paid my money I was more than happy.
I think if I was to look around I've got Preplogic DVD's, EC-Council v4 Courseware, an Exam Prep book, Boson practise exams so I'm hoping I have enough around me to pass this exam.
Hope this helps a little.