Not generally had any problms with glides as it is easy to get the drag flaps deployed at the 100' point and get a nice firm landing as a result. With flapless just remember to widen your base leg slightly to account for the shallower faster approach path.
FNG,
The 1000' method is described in the Thom blue book. It is what I was taught and works very well indeed. However, the Thom suggests the Key Point method has advantages. The key points being 2500' on crosswind and 1500' late downwind. The advantages being it is harder to lose orientation with your chosen field and you naturally develop a good approach earlier on in the process. Not tried it though.