I am partial to KEF loudspeakers so my opinion may not be totally objective.
I have a pair of Calinda as well as R104ab, Carlton III as well as a pair of R105.
The Calinda, R104ab and Carlton are more or less the same design; an 8" woofer coupled with a B139 PR and a tweeter, either a T27 or T33.
All three sets are similar in performance: Moderately deep and well balanced bass with smooth midrange and more than adequate extension in the high frequency.
They can fill up a medium sized room with a 70W amplifier. They are neutral and perform well with classical music and jazz. Not that they are bad with traditional rock - just not "boomy" enough to the likes of some.
Compared with the Reference 105, the latter will make you feel the low frequencies on the sofa or your body in a relaxed way. The Calinda are a bit more discreet in the low end.
Are they a decent set of loudspeakers? Certainly and for $175, they are a very good buy.
One point though: I've found that after the 30+ years after they were made, the ELCAP capacitors seem to drift in values. On one of the crossovers one capacitor had drifted that badly that the tweeter hardly gave any sound. They are probably going to need a recap but then they will perform like charm.