Been doing it since August and have lost about 25 pounds. It's slow, but it's easy, sustainable, and it works. I'm slowly moving over to a 4:3 plan to help speed up my loss. There's a really great group I'm in on Facebook (they're mostly Brits...lol), let me know if you are interested. The support is excellent.
As you've already noticed, you'll lose a lot of bloat at first, and then you should expect about a one pound loss each week. I notice your calories are really low for a non-fast day - not necessarily anything wrong with that, as I real encourage eating normally (until full) on feast days rather than calorie counting - but you may want to reconsider that amount if you notice yourself struggling with hunger or not losing.
There's a few of us doing 5:2 in the IF thread on here somewhere.
For me, on a fast day, I like to eat all my calories in one evening meal (though I do drink coffee with milk and honey in the morning). I do not count calories at all unless I notice myself not losing anymore (helps me get back on track as sometimes I start going overboard on feast days), though I do typically weigh out my food for fast-day meals.
Also, my IBS has disappeared completely and my hair is growing like crazy!