Wow great post and thank you so much for that. Just the information and comparison I was looking for. I realize in the end I just need to make a decision but hearing from someone who has used them all makes a huge difference. Im leaning heavily towards the SM045 with the only slight consideration still being maybe a SI 3D....with the only real thing being the wider temp range, larger wheels and slightly less cost. Im not sure any of that is a deal breaker when I just want the best of the best.