Been using it for about 6 months now and mostly very positive. I love being able to update an expense claim as im on the go. Means i no longer have to carry large amounts of receipts. Also, love being able to log an expense in the local currency and have it convert to sterling for me (you can also override the exchange rate if required).
Couple of small niggles; adding an email to an expense claim is a pain in the backside. Usually you have to copy to a word document, then pdf it, before uploading. Also, no app for the BlackBerry Z10 which means i have to use my personal iPhone to upload. Final niggle, the support is terrible for it. The response is usually quick but the information provided is sketchy and sometimes incomplete.
On the whole though i find it fine to use and an improvement over our previous manual submission method.