The Time Frame 600 is a fair amount better than the CX 27... The CX27 coax mounts an Audax Poly carbonate dome to a driver.. Trying to achieve a point source. . The TF 600 Uses a thin slanted cabinet, mounting the tweeter above the mid bass on a slope trying to achieve time alignment. On the 600, the crossover is full of electrolytics. If you replace even just the couple of mid and tweeter caps with even cheap poly prop caps, this speaker responds well.
Both are out classed in todays audiophile world, but for fifty bucks and just $20 or so switching out those caps, these are satisfying speakers.
If you are ok with that, you can't lose.
I hope this helps, Tim