Thanks for the info. I had an SP101 and I liked it a lot. It was just a little on the heavy side for me. I am comfortable shooting hot loads in the lightweights but I do agree, the larger grip size and weight of the SP101 makes it much more pleasant to shoot.
I figure for the 99% of the time I am carrying it versus the very small percentage of time I'll actually need it, the ultra-lights are a good trade-off in comfort and concealability vs. controllability.