I don't think any computer desk or chair combination in existence can keep you from having high back pain if you work at a computer all day. Ergonomics experts are making a killing saying they can prevent bad back pain, but pretty much, it's just making sure you actually get away from your machine for a couple of minutes at least every hour, if not every 30 minutes or so.
I have trapezius pain on my right side, probably from using a mouse so much. It can get pretty bad, and the only thing that helps is reducing my computer use and taking NSAIDs. They don't bother me, thank goodness!