[rbritton]

Dash's search speed puts Xcode to shame. It makes development much, much quicker for me.

[josephlord]

Dash is still good but not quite as essential with Xcode 5 which is MUCH faster than Xcode 4 for documentation searching.

Dash also has all the other docs you need (C/C++ standard libraries, SQLite and Flask/Postgres/etc. for the server side and even man pages).

[rimantas]

And in two days you will not be allowed to submit apps built with Xcode < 5 to AppStore.