Better than a BU-353-S4 USB GPS?

[Renate]

I've had a BU-353-S4 USB GPS "hockey puck" running 24/7 and I really don't have any complaints.
Still, it only receives L1 (and not L2?) and Glonass, Galileo & BeiDou remain foreign words.
Am I missing out on anything as far as availibility and accuracy goes?
Since it's 24/7 anyway, capture is not a biggie.

Glonass & BeiDou don't sound very accurate.
Are L2 and/or Galileo worth it?