It will only hurt a little
Excelisys definitely knows what they are doing. They even gave me an official breakdown of what to expect as we incorporated our new software to our users ("They are gonna hate you for about a week, but shortly after you will be their new best friend";they were right).
We have every intention of keeping Excelisys on board as our main FileMaker Pro consultants, as they have proven on repeated occasions that they are willing to go above and beyond what is expected in order to make our software we we had them custom build for us work. Furthermore, they respond in less than a day no matter what the issue is, and are always accountable for any errors they have make on their part. It's like having a whole IT team built right into the company.
Don't be stupid...pick Excelisys.
Quality of WorkGood