I took up gliders after soloing in power before I completed my PPL.
In retrospect, I feel it would have been more efficient to have completed my PPL before stepping into gliding as there are different mindsets involved, i.e certain power habits will get you into trouble in gliders while certain glider habits will get you into trouble in power.
But if you have the time and money, there's nothing wrong with visiting the local glider clubs to get acquainted and taking the odd glider flight.
Just remember that there's often a big price difference between intro rates and member rates. Some clubs offer a 5 flight membership or suchlike as a step before taking out a full membership.