I got to try out the SG 157 for the first time yesterday. I started off the day on my Coiler 171 and after a couple of runs, the snow already started to get soft. By the time I switched to the SG 157, all the firm cord was gone, but still carvable.
Even with the soft conditions, I was laying down hip-to-hip carves almost immediately. The last short alpine board I had was a MADD 158 (I think 3rd gen). In the soft groom which got cut up quickly, I definitely prefer the SG over the MADD.
It's been over 5 years or so since I had the MADD, but I remembered it feeling a little squirrely at higher speeds. With the SG, I was hitting 42 mph and feeling completely comfortable. I was more worried about hitting a slow spot and going head over heels.
On the steepest run I had available at Bear Mt, I was able to lay over a tight carve and go uphill to scrub speed. I was worried the variable side cut might make it difficult to complete a carve.
SG doesn't have recommended weights on their spec sheet, but the flex on the SG 157 FR PT felt for good my 140-145 lb (with gear).
Being in So Cal, in March, I probably won't experience any icy conditions to test out the SG unless I take a trip to Mammoth.