Good parts:
Less memory usage (no client or rendering) so you can host and do other things with less lag.
Clients wont see "LAG" with their controls frozen when you do anything that slows Blockland down. alt+tabbing out of fullscreen, doing something in options, watching explosions or other intensive occurences.
Ability to join other servers while hosting.
Ability to raise max players over 32. Remember to forward extra ports, example, 100 players would need ports 28000-28100 forwarded
Bad parts:
None.