Hi
I moved recently from Squeezebox Touch to BDP-1. I tested both connected to BDA-1
There is indisputably sonic improvement of BDP vs SB. I am not skilled in explaining the differences, however an example of how my wife perceived the difference:
- voice reproduction: with SB was like the singer keeps the microphone to close to his mouth, while with BDP every word is very clear and articulated
- staging: with SB is like I am sitting in first row of the concert and a big speaker is shouting at me, while with BDP I am sitting few rows back and I can relax listening at music
Now, on the ergonomic
SB have better interface for PC or smartphones; never crashes. Moving to MPDroid there was a learning curve. Initially I was thinking the control is terrible, however after one week I was totally comfortable with the new interface
On the other hand, with SB I had to keep my PC on when listening to music; this was generating little, however audible noise; with BDP I have a silent setup composed from 3TB HDD connected to a USB 3.0 interface, kept together in one decent looking aluminium case. I have to update from time to time the HDD, however my music collection is quite stable, so this can be like weekly maintenance. If I want to listen to a download faster, I just copy it to a USB flash drive.
In the end, on the features:
SB provides very complex tagging statistics, lots of plug-ins, integration with lots of internet services. BDP is very simple on this. However, on SB I was using only integration with Last.fm for reporting played tracks, so not much missed from my side. This is doable for BDP also, if software engineers from Bryston would like to do it.
It is for you to decide, there are some trade offs, in my case are acceptable, for a good friend of mine were not acceptable. He ended up upgrading his SB Touch to Squeezebox Transporter from the same family, it is end of life however can be found on internet.
We both are very happy with our decisions

PS
Would you like to post some impressions on B135? Product is lacking reviews and I am quite curious how people are perceiving it.