I've had an original Swisstool since about 10 years ago, and the quality is fine, but for me it's not as comfortable as my Spirit. Sorry, I forgot which version my Spirit is called; it's the one with the standard spear point blade in place of the scissors. This Spirit is my favorite multi; it's perfect for me and I carry it every day.
I sometimes have trouble pulling out the tools on the original Swisstool, and there is play when the tools are locked. Also, I have to be careful closing the saw, because it's slightly bent and can close teeth-first into part of the handle.
I find the Spirit is more user-friendly for myself, and the bow-shaped handles are a help in that. I can access all the tools easily. Also, all of the tools lock solidly w/out any play. My Spirit seems to have a higher level of precision than my Swisstool. And the medium size is just right, IMO.
Jim