i just did the cost of my pavers in their calculator, if i remember correctly i paid about $10 per sq ft for material/labor for my hardscaping. the basic price quote by the site was 9.16 and the better price was 12.36 and best was $16.10 so it seems reasonable.
I've put it in a variety of different tasks, electrical, plumbing, landscaping, painting etc, and the costs are comparable to what we've actually done.