What surprises me is that all the comments so far don't mention anything about what gear you will be using it with. This stuff needs to be paired with appropriate electronics, and without knowing what you've got, and if you plan to making other changes to suit your chosen speaker or not, makes a big difference.
FWIW, IME The Merlins can provide a level of transparency in the mids and treble that will let you hear more of what's in your recordings, and prove more satisfying over the long run.
I've always found the Harbeths pleasant but lacking. Yeah that will make some crappy recordings more tolerable, but in general that kind of thinking is not how you want to build your system.
Disclaimer: Merlin owner. That's because I think they are one of the best values in all of audio and can be the centerpiece of your rig up through very high levels of performance. Cheers,