I have NO personal experience with the SIG 1911.
I do have experience with SIGS---I like them---A lot.
I have read commentary, here and there, some good-some critical. Most of the criticsm was concerning fit and finish on the first model. I hve not read of any who had issues with relaibility, this is not to say that there are NO issues-but I have not read of any.
If it was a SIG I would bet on it.
Blessings