I compared a number of cases online before opting for this one. It looked roomy enough to contain my Nikon D5100 18-55 kit plus my 55-300 zoom and flash as well as the usual extras like spare battery, charger, gorillapod, filters, flash bracket, etc.
Indeed the case swallowed them all easily and comes with a comprehensive set of re-positionable dividers that pretty much lets you configure it any way you could want. There are useful extra pockets on the front, net sides and inside the lid that are great for memory cards, odds and ends and even the camera manual. Altogether quite capacious while still retaining easily portable external dimensions. It even has a useful rain hood tucked away inconspicuously in its own pocket at the bottom on the back.
At this price I did wonder whether the quality would be up to the mark but I was actually impressed. The material and construction are substantial and good quality. It looks like the sort of bag that will give years of service. In fact, I was sufficiently impressed that I subsequently bought their Easy Access SLR Camera Case for Nikon D5100 for those times when I don't want to lug the full kit but still have good protection for the camera itself.
No need to pay inflated prices, this case does just fine.