Solid product. No wobble or jitter when raising or lowering. For the tabletop I just went to Lowe's and picked up a 2x4 piece of glued wood for 30 bucks and it worked out great.
I have been using it for the past few weeks and I can say it's very sturdy without much wiggling.
I have been very happy with this desk. I was nervous when I bought it because there were not many reviews at the time. After using it now for over 2 months, I can say that it was the right choice for me.