I also have experience with Montessori. I wasn't looking for anything except a good daycare/school. I still am not sure what all of the "tools" and procedures are for in the pre-k ages but my kids thrived there. I will say not all "montessori's" are the same and once ours gets to kinder it begins a transition to more typical school-like activities, even more in 1st and 2nd grade. So I don't think it is a traditional type montessori all around. Any school can call itself "Montessori", they may or may not be certified by one of the national organizations. This may or may not make a difference as they could use the methods and still be a good school.
That said while we loved it, I know some friends feel the girls liked the environment better than their boys did (I only have girls). Another friend had a boy that just didn't thrive with the "structure" at the particular school he was attending but I think this can be school/teacher specific.
I'd give it a chance. If it was the director, I don't know that I would put much weight toward that. The first time I went to visit the school we go to now I discounted it because of the "uniforms", the fact that we couldn't go into the classrooms for drop off (it seemed weird), and I didn't mesh with the director. We ended up there after a trial somewhere else and we've loved it. The director is still there but it's the curriculum director that makes our school the place that works for us. She's constantly challenging the kids to do more.
