I took advantage of this offer last week and am extremely satisfied.
The shelves are about an inch thick--VERY heavy and rigid. They are particle board, but primo quality, and the photo-laminate has a convincing, wood grain appearance. Assembly is about an hour with a phillips screwdriver and a hammer (to tack the back onto the frame). Bush furniture doesn't have the best "fit and finish", but the materials are rock-solid and the designs are well-engineered.
For $35+tax, and free delivery, it can't be beat. I ordered mine online at about 8pm and received delivery (via Office Depot truck) before noon the next day. Only one data point, but this is much better service than I'm used to getting from Staples.