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I have a v1 Outback (currently for sale!) which is very similar to the latest Swiss Cross geo-wise. It's great on light gravel and pavement, to the point where I just didn't care about having a road bike anymore. For UK MTB trails it did feel a bit under-biked but it more than makes up for it on the road. The geo feels more stable than a true road bike (longer stays in particular) but it has a nice springiness to it and it's definitely not overbuilt (like many Surlys are). My advice would be to put the biggest tyres in that you can (40c?); there's very little downside for more comfort and better handling in sand and mud.
Interested to hear peoples thoughts on the Swiss Cross (newest model) as a light gravel and ultra-endurance road bike? Thinking of building it with 35mm tires. Anything about the geo that makes it not ideal for long road rides? I currently have a Surly Midnight Special which I also use for the same purpose but it's heavy and dull.