42t chainring from TA, BBG super light chain guard on the outside, n-gear jump stop on the inside, on SRAM exogram crankarms - with a 11-28 cassette.
The chainring has shift ramps/pins; if I were to choose again, I would go with a Thorne chainring specifically designed for single ring setups (http://www.cyclocrossworld.com/thorne-k ... -chainring
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The chain guard performed flawlessly throughout the season. IIRC it is only 2mm thick, so I imagine it could bend easily if hit.
The chain dropped several times on the inside, but only when pedaling backwards (probably the chainring profile helped with the chain drop). I am ready to switch to another system on the inside, provided I find something with a similar weight (about 37g IIRC).
Last complaint: with the exogram cranks, I had to mount the chainring in the inner position, for I needed room for the outer chain guard. In order to get a better chainline, I flipped the chainring - the bolt heads were not supported by the grooves in the chainrings, as there were no such grooves on that side, but it held well during the 3.5 months I ran this set up.