I have done diving at both the Mt. Lavinia centre and the Negombo one.
Both have been great experiences. The instructors are internationally recruited rather than native Sri Lankans which usually helps against the language barrier as the native english can be pretty rough for detail-oriented communication such as diving. But both the crazy and lovely bulgarians I got my Open Water Diver License under and the englishman who supervised my way to adventure diver have been easy to deal with, professional and generally nice people.
The dive centres are small and simple but the gear has been good. No problems there.
The only problems I've had diving in Sri Lanka has been one or two turns of bad visibility (weather, nothing to do about that) or personal issues like seasickness or a pesistent cold.
I've had very good experiences on my dives with Colombo Divers and they have always been flexible and service-oriented. They will get you sorted even when you're short on time.
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