Well. I'm excited about it. Theres alot of pros and very few cons (the price)
Looking at the i/o - I definitely have to wait for the rack version - the Stadium doesn't have enough loops (it has 2).
For me - the skeumorphic interface is frippery - I like to see it but don't need it. Bluetooth and wifi control - nice to have (but again I don't need it). The improved processing /architecture/memory/new modelling engine (Agoura)... yes, I like, that and for a device to be around for another 10 years it'll need it. Being able to use existing Helix presets - apart from the cabs) - also nice..
Being able to split inputs/outputs and apply different eq - that's cool. The ability to have an audio track split into stems to play along with or control fx changes or external devices is cool. I use the SPDIF as a loop separate from the main output, and have different EQ depending on whether I'm using the TS and XLR outputs (they go to different devices).
The capture tech.... its a computer so being able have its own tech or use NAM - is something folks have been asking for and its there.
The only con for me is the price. To get the I/O I'd like, I'd need* the XL ($2200), and L6 charge more for the rack version.............if they make one (the rack followed months later after the OG launch). Its less than an AxeFx - its tantalisingly around the $$ of me selling my Helix and Kemper**.... although their value is set to go on the 'hey look at the new thing' value rollercoaster.
* ha ha, I play guitar at home, I don't 'need' anything.
** unlikely, I see my Kemper as an amp collection to stop me buying amps...... with varying degrees of success.