The nashbars has been around longer than most. The thing about it is that it has several hand positions but because of the figure of 8 configuration, some of them are to the rear of the bar clamp. For most MTB riders the top length is already too short. Of course if you want to shorten your reach, then you are ready to go.

In general while trekking bars sound like they are designed to do something serious, they mostly just offer multiple bad hand positions. Ergonomically the most comfortable positions are with the palm facing about 8-9 o'clock where a handshake with the right hand would be 9 o'clock. But personal preference is the key, so a shake out cruise would be useful.