Interestingly, in the UK, ABP monitoring is not used routinely, as no-one quite knows what to do with the results.
Some time ago (mid nineties) there was a paper on treatment of BP based on ABP readings.
Showed that long term outcome is better if you treat on what you read in your consulting room rather than go on ABP.
The logic was that people who's BP goes up when they see you also are more likely to respond with a higher BP in other 'stressful' daily situations.
I'd say that 90 percent of ABPs I do only confirm what I already knew from taking readings in the consulting room. BP is not well controlled!