Last Saturday I went to a gig with just my bass and the HX Stomp. The Stomp went straight to the PA via TRS-to-XLR adapter, and the sound guy feeded the sound back to the stage monitors. That was all.
I haven't had such a clear and transparent bass sound on stage in a long time. Perfect.
But as always, your mileage may vary, depending on the venue, the sound guy, and the music style you're playing.
Other times I'm usually taking an SWR Workingman's 12 combo as my stage monitor, using only its FX return = power amp input.
(Zdravím do Teplic, občas tam jezdím za kamarády z kapely Aku-Aku. :)