It includes the following tools:
Chain tool: 8/9/10 speed compatible
Spoke wrench: #0, 1, 2, 3
Hex wrenches: #2, 2.5, 3, 4, 5, 6, 8
Screwdrivers: phillips #2, flat #2
Open wrench: 8mm, 10mm
This should help you cover plenty of problems if you're out on a ride and something needs adjusting or if your chain breaks you'll have the non-bulky chain tool to fix it. The chain tool also unscrews fully so it can be used as a spoke key- useful providing you know how to true your wheel, (it's easier than you might think).
Although it doesn't come with a case, it does come with a durable rubber band, which fits around the tool. At first I couldn't figure out exactly what it was for but after a bit of use I learnt it's very useful to have on when using an allen key for example the chain tool can flop about annoyingly, the band keeps it in place out of the way.
It weighs in at 168g due to a wholly metal construction so if you're putting it in a jersey pocket it might become baggy- so best place for it really is in a saddle bag.
In conclusion it's great for roadside repairs and adjustment- it can be used in a workshop of course, but may be a bit too bulky/fiddly for working on bikes for a longer time, where individual tools such as a hex wrench is easier to use.
I've found it's cheapest on Wiggle here. Don't quote me on it!