I bought the Si2 because of the more traditional look at address over the PTM2 that I have. I love my PTM but the Si2 is just different in a good way. My putts/round has decreased since putting it in play and I don't see it leaving my bag anytime soon. Shout out to Brandon at SeeMore as well for all the help getting it dialed in to my stroke over email. SeeMore’s customer service can’t be beat.