Pi Zero first time boot can take 4/5 minutes, normal boot is less than 1 minute. Some (dis)advantages of this image (and Rune on a Pi Zero generally) are:
- 1. The PI Zero has no onboard wired Ethernet. Wired ethernet is definitely better than WiFi for streaming radio, Spotify, AirPlay and UPnP/DLNA. The onboard WiFi on the Pi Zero W (and on the Pi B3) is not brilliant, if you want to use WiFi an external dongle is recommended. The Access Point function makes WiFi on the Zero W and B3 easy to set-up.
2. AirPlay (shairport) consumes large amounts of CPU time on the Pi Zero. Even so, I have not yet experienced playback problems with this.
3. The quality of the sound cards for the Pi Zero are, in general, not as good as those for the Pi B+/2/3 versions. On the other side of the coin, the Pi Zero sound cards are a lot cheaper than those for the Pi B models. You could choose to use a sound card for a Pi B+/2/3 on the Pi Zero, looks strange see here: raspberry-pi-zero-support-in-0-4-t3711-80.html#p23517 This provides you the option to start with a Zero and later upgrade to a B3.
4. The Rune UI responsiveness is almost identical on the Pi Zero and B2/3.
5. Total cost for my cheapest Pi Zero & TI PCM5102 DAC (including case, power, dongles, cables, SD Card, etc.) was about €30 (lots of ebay shopping and use of recycled parts to get the all bits so cheap). For my Pi B3 & HifiberryDacPlus (also including case, power, dongles, cables, SD Card, etc.) it was about €130. The price difference is significant.
6. I do not expect a full functional version of the new Rune 0.4 being released for the existing Pi Zero model. I expect a lot of the extra features to be switched off, there are limits to what the Pi Zero can do. It would be nice to be proved wrong on this one