Updated: October 2012: Carlo finally got back to us (after 14 months of calling) and came over to review the required minor "fix-ups"; although he maintained that the problem was with the underlying masonry and not his repair work, he repaired the parging and cut in expansion grooves to prevent future cracking. The job has now been completed satisfactorily.
If you do deal with this company, ensure that the written contact spells out clearly, and in detail what work is expected to be done, what problems will be fixed, what guarantees are applicable and what response times for any required follow-ups will be provided. Spell out detailed financial penalties for not meeting any of these commitments. Carlo's initial work is good but his attention to providing follow up contact and services needs work.
Initial review August 2012: Avoid this company at all costs. Once they have your money, you will never see them again despite impressive looking written warranties in contracts. Should follow up work be required, it will not be done. Phone calls are rarely answered and phone messages are not responded to. If you do get to talk to someone, excuses for missed commitments will be given and new promises will be made, only to go unfulfilled.