I had a CT 152 and it was a terrific performer with some limitations.... On any objects fainter than about 4th-5th magnitude the CA was not visible. My recollections as a general use scope:
By observing category:
Planets/lunar. A great deal of of CA. But the scope still resolved lots of detail. The detail was embedded in a purple wash of light.. Great? No. But decent enough to clearly show the GRS and festoons in the cloud bands of Jupiter, craterlets on the floor of Plato, cloud bands on Saturn, etc. After a while your brain sort of 'disregards' the purple noise and allows you to see more than you would think.... 6/10
Bright stars: I'm not sure why anyone would look at bright stars like Vega or Aldebaran in and of themselves...But the CA is brutal! 3/10
Double Stars. This is a very much "it depends" category for the CT 152. On bright pairs like Albireo the CA overwhelms the colour contrast. On pairs with one bright companion and one faint one - e.g. Delta Cyg - the CA of the brighter component will bury the faint component. BUT for pairs where both components are 5th mag or fainter, like the vast, vast majority of double stars, the CA gets out of the way entirely and the CT152 displays a text-book diffraction pattern and can split right down to its Rayleigh limit. Superb! 8/10
Wide-field Deep Sky: Marvellous!! A 31 Nagler gives a 2.9 degree field at 29x! Milky Way sweeping, open clusters, dark nebulae, Veil Neb with UHC filter, larger galactic nebulae like M42 etc. are fabulous! Views not very much distinguishable from APO refractor.. And the scope bears high magnification very well..... 9/10
Narrow-field Deep Sky: Resolves quite a few of the brighter globulars (it is, after all, only a 6-inch scope). Carbon Stars like T Lyrae showed the deepest red with no CA.... Planetaries with O III filters are great. Galaxies look the same as in pretty much any other similar-sized scope. (I got almost 300 of the Herchel 400 with my CT152.....) 8/10
Astrophotography: Don't laugh! With narrowband filters, nice monochrome images can be had! Or three-colour composites with careful re-focusing for each colour filter.... Bit of a PITA but worth the experimentation if you have an EQ mount. (Mine was on the Discmount DM6 so I'm only relating what i heard of others doing....)
Considering you can get one used for maybe $600-$700 it's not a bad choice...
I might even look for one....