To be honest no, the main problem is landing an is simple maths. With a 25m span but the wingtip being only 3 - 4 ft off the ground you have to ensure that the wings are absolutely level to stop the tips hitting the ground. A lot of clubs like ours have one strip, so a crosswind of some degree is the norm which gives you little if any room for error. Doing that in an unfamiliar glider, costing if I remember about £100,000 gives you a few nerves.
Pilot Induced Occilations do happen in gliders but it isn't a common problem. Right from the beginning you have to learn had to do contra inputs to fly and turn. When you start to thermal you have to get used to the delay in the instument readings and how to anticipate lift it becomes almost second nature.
The extra wingspan doesn't give you any real problems in the air apart from a dreadful roll rate. This can be a disadvantage if conditions are difficult and you have to hunt (often called scratching) for lift. Reacting to an indication of lift sometimes demands a swift responce and the extra span can reduce your chances of finding that lift. Once your in the lift, then the span comes into its own so its a balancing act.