Harbeth 30.1 or legacy calibre

I should add... that... the combination of the Harbeth 30.1’s driven by the Hegel H300 / H360 integrated amp or the McIntosh MA252 integrated amp may be one of the best values in audio, if you pick them all up on Audiogon, or USAudioMart, for used prices, and mate them with a good DAC, like the Schitt Yggdrasil (which is also one of the best values in audio). Though, the Hegel also provides a fairly good DAC to make it an even greater value. You could spend a lot more, and do no better, or even worse.

And... correction... I meant Legacy Audio Calibre, not "Clarus."

I owned the Harbeth m30.1 for 6 years and think they are a very enjoyable speaker.
While I wasn't  diisatisfied with the m30.1, I had the opportunity to hear the ATC scm19 and ultimately sold the m30.1.
I was very surprised that I preferred the ATC mids and they had far more neutral and punchy bass. A great little speaker with a lot of pedigree - and ATC make all their drivers themselves.
Perhaps a downside for the ATC is that they require a pretty hefty amp - 100W plus. The Harbeth played well with lower power amps. Neither are difficult loads though. 

I’ve heard both, own one. Audiotroy gives a very good answer, you will be delighted with either it’s matter of you deciding which one. Remember to factor in your decision that you’ll need a stand, fortunately there are available  stands for both.

This is an old post...i owned the Harbeth 30.1 for about 1 year and they were very nice. They were lacking sparkle and efficiency. 10 sets of speakers later i now have Audiovector SR3 Avantgarde Arrete. Highly recommended if you can find them on the used market. 
I heard the Legacy at a few audio festivals and they always sound very thin...not my cup of tea