Electronic Bass Trap Experience

Does anyone have any positive experience with the PSI AVAA C20 Absorber? Probably would need at least two. I prefer not to stuff more boxes and tubes into the room. I have all 4 corners of a symmetrical room (425 s.f., vaulted A frame 7-13ft) treated with 16” square rectangular tower traps but need a bit more management for the 40-80Hz octave. Thank you, Dave H