I play with the 98 SL and once ordered a UL version for doubles. I must say, and this is the first and only time I have said this about any Fischer, I didn't like it. I missed the solid feel of the SL. The UL felt hollow (I know they all are) and much less able to handle sustantial pace. Groundies came up short and serves had less pace and depth. I've stuck with the SL for about 3 years now (105 and now 98's), and have just started playing with the m comp but I still pull out the 98's when I need a pacifier. Great quality, great frame.