I can sort of see (well, hear!) the point people are making about the amp section, I will confess openly that my Pure II+ has way more headroom, power and clarity compared to the onboard amp, then again, should be considered that the amp on its own costs the same, if not slightly more than the mojo (depending on your market) so I would be upset if it wasn't better!
That being said, you have arguably a world class DAC and a pretty damned decent amp enclosed in a really small package for what is ultimately a very modest price...
You shouldn't be disappointed with it out of the box, but always consider that it has a line out mode for a reason, and if you have a good enough amp that still fits in your pocket (thankfully the Vorzuge fits in a very similar footprint!) then why not, best of both worlds