I started working on Vids comparing the TS orange, to an SPS, and a Tanfo Limited.
I sold the SPS - its a good gun, but the grip on the TS and Tanfo is more ergonomic. It feels like the SVI or PT EVO grips where the SPS has the old school plastic. When I look at $650 to upgrade the grip, it just wasn't worth it to me.
That also may be a difference I felt the SPS jumped around a lot more than either of the steel guns. I would assume the weight here is the difference.