As someone who owns or has owned every MX switch, multiple types of ALPS, BS, 45g and 55g Topre, I would say the 55g is definitely worth it. The 45g doesn't feel that great to me to justify the cost. TP and all the other Topre haters probably have only tried the lower weighted Topres, and I can see why they think they are overrated. 55g is only a 10g difference from the 45g, but it feels like much more. The 55g is very tactile, more than MX blue or BS in my opinion, then very smooth to bottom out. It feels like no other keyboard, in a very good way. The 45g is just smooth, and feels like a really high end rubber dome.