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Do you use the TSO in any USPSA competition?
I do not have a Tso. A lot of guys will tell you to just run whatever you have and whatever division you can. I think that's good advice. If you do not yet own the gun that you want to use, and you are trying to decide on a purchase, you will not be disappointed in the Tso in The Limited division. It will be virtually the same thing as a czechmate in limited Format, but you won't have the advantage of running major power factor if you do not get a 40 caliber gun.
Several people will tell you that running minor power factor is not a disadvantage in The Limited division, and that really depends on just how good of a shot you are. If you want to run open, it seems to me that you want to run major power factor.