I've been playing around with it the last week or so and really liked it.
It allows importing trezor xpubs so you can watch your trezor addresses (and generate new ones). They also give full control of what fees you pay -- so you're not stuck paying some kind of dynamic fee you don't want to pay.
And they have stealth addresses!
It would be cool if we could do an AMA with one of the developers/founders.