They do come in different modes, such as DAO and QA, which is similar to the Glock/XD/M&P. I have also been itching to get one for a while, but I would like to try one out first. Of course finding one to try is a bit hard.
Two months ago I purchased a Walther P99 DAO. Trading it in on a Glock 19 next week. The DAO stands for dual action only which for this gun works poorly. The trigger pull is inconsistent, rough, and very long. It is also more pds than it needs to be. Because the pull is long one's finger will rub along the bottom gaurd every time. As a result accuracy suffers. With the slide removed one can pull the trigger and feel the roughness of the trigger mechanism and if pulled slowly will even lock.
The gun is a beautifully designed weapon and ergonomically well fitting. Unfortunately, the DAO is not on my to own list. One thing I did find is that my accuracy with other firearms greatly improved after shooting the DAO.