I played with Expensify when at my last job, but only the free side and only on the Android app... it was nice, but without the automatic charge importing from a credit card it's hard to compare apples-to-apples with a full Concur implementation.

Concur also just released a new UI that does seem a bit nicer/cleaner/more modern but doesn't seem to change much in terms of functionality. The main improvement I see is quicker access to receipt thumbnails without having to drill down 2-3 layers. It was just rolled out to me today and will become permanent on Feb 15.

Between the Concur UI upgrade and moving from the legacy BMO card to the Diners Club card (with free airport lounge access) I'm pretty happy with what my company's accounting department is rolling out for 2015!