We did drain tile on half of Michael's basement last year. Why only half? He had just finished remodeling the other half and we couldn't bring ourselves to destroy his beautiful new bathroom and bedroom for such a small amount of moisture. We played a little wait-and-see. Fast-forward to this summer- with all the rain we had, he saw more moisture on the finished side, and we decided a French Drain would be the best of both worlds- get water away from the foundation at a high velocity before it can sink into the soil, and save the finished basement. Waiting for next spring/summer to get the true final results, but we're feeling confident!