I'm pretty sure the SPK pros are the same as the SPK 100's? Well this boot has worked out really well for me. I'm not too fond of how stiff it is, but its supposed to be a stiff boot for going big. Buckles and everything has held up well. They're comfortable and warm. I love the cushioning it has in the toe and heel! It really makes those hard landings softer. Although I would like to see a softer tongue that fights shinbang a little more.