This is meant for bedroom low volume type playing only .... and, like me, you spent all your hard earned cash on a Kemper - and rightly so - but now have to save up for a decent monitoring setup... My background: 20+ years of playing and semi-pro gigging as a bassist, drummer and guitarist (anything from Dutch Crooners to Punk and Grindcore)
I just picked up a secondhand Behringer Eurolive B212D for € 120.
Compared it to my powered Behringer 2031A and old Roland Cube 60 cab - roomsize 2.50m by 4.00. My verdict:
1. 2031A powered monitor - 8" tighter bass, more definition
2. Eurolive B212D - 12" more in your face, semi-annoying hiss, overkill in a residential area
3. Roland Cab - 12" utter crap, no other decent cab available so no fair comparison there
If you don't play any other music over your speakers in your bedroom besides your Kemper - I'd choose a cheapo secondhand FRFR over powered monitors. Anything sized bigger than 10" is probably overkill. Or get a 12" if you plan on getting it to rehearsals, small gigs.
The guy who sold me the B212D and delivered them at my doorstep - who himself played drums and some guitar for over 30 years - was floored when I played a POD X3 Live with a Metallica patch over it. It gave him goosebumps - he said - as I was just churning out some washed out chords and a sloppy rendition of Sad But True. Did not dare go beyond 30% of the volume. The seller jokingly asked for his money before it would explode. So it's an incredibly loud (half-way) decent speaker i would say.
Sure I want my RCF 12A, Matrix wedge, or whatever quality monitor I can audition locally before buying but - in the mean time - saving up for it I go chugga chugga for 1/10th of the price