It has a built in version of stamina, So yeah end mods work well.
They're a necessity.
(\_/)
(O.O) Bunny: Our time is coming
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actually: as far as I know and as far as I've experienced it up until now:
The built-in endurance recovery will, without slotting, roughly compensate the endurance drain of the shapeshift-toggle (yes, it has one and it can drop If your endu is at 0 
), but not give you a significantly better endu reg than you have in human form.
With three endurance recovery SOs it's still weaker than 3-slotted stamina, but should be enough.
However: I never use dwarf form for too long ... so for me it's not worth slotting endurance there too early ... rather sometime in the 40s. (me=triform ws)
If you want some figures, then take a look at this link on the US forums. I'm not sure if he means half of a slotted or unslotted stamina. Possibly better off using those three slots in the dwarf powers themsleves to reduce the end usage there instead?
I think it depends on how much time you're intending to spend in Dwarf. The attacks are expensive so if you want to use those a lot you'll probably want to slot for endurance recovery too.
Agreed.. my own Dwarfs on the PB(50) and WS(50) have always been mainly 3 RES , I only mainly use the Dwarf for minor tanking and Mez protection the rest I leave to human/nova.
But I have found that the Dwarfs' innate END REC is fairly decent enough to hold it's own. But it's the same as Nova form, all depends on how long you're attacking in that form and what you intend on using it for most.
quick question are end reduc's useful? heard some people say its a good idea to have one but some people says there's no point.
got 2 end mods in it atm (and 3 res)