Integrated Amp upgrade path


I’m currently using a Macintosh MC 8900 to drive Vandersteen Treo CT’s, with a six pack of Rel S510’s, streaming only.  I understand Boulder will shortly have a software upgrade for the 866 that will include an Air Play equivalent to allow full use of most streaming services.  Looking for thoughts from anyone with experience with the 866:  how much of an an SQ improvement with this upgrade?  Incremental?  Immediately noticeable?  Thanks for any help!
cosmic_charlie
@mrklas - I’ve heard nothing but praise for the Mind2. Can you elaborate in what way it is better than the Node? I would love to audition this component sometime in the next few weeks. 
From someone who started with a bluesound node 2i and then added an external DAC and then moved on to an Aurender streamer I can say without hesitation... it all matters.  The streaming source matters and the DAC matters. Cheap streamers with lackluster interface apps are just that. If they fill your needs and satisfy your use case then knock yourself out. Why would you spend more? That said, I have yet to meet someone who made the jump that regretted doing so. 
Coda is one excellent company where you get more sound quality and build vs the competition  per $$ dollar spent and I have heard several over $10k 
not as good and 3 wpc choices ,% into pure class A .I choose the V1 option 150,300,600 wpc ,18- 1st watts in pure class A . The excellent separate preamp section is also in pure class A.
and many class leading  parts in this the design .the build quality is exceptional . I ordered mine with the 1.0 uf  VH audio Odam  ,capacitors which I feel are betterThen the very good stock 
Multi caps and Huge class leading 3k va potted transformer which  produces  over 120 amps on tap with exceptional control and dynamics. It is a steal for $6500 ,the price will be going  up to $7 k soon I suspect.one more things 10 year warranty,5 year transferrable.   http://v2.stereotimes.com/post/coda-csib-integrated-by-richard-willie/
guy-incognito +1 to adding an external DAC; big improvement - not even using a really high-end DAC.