Experiences with Coghead to implement one elementary CRM ( 5 users, 5.000 registers ) or so ?

What are your experiences with this source? Pros vs. Cons. based on
your experience, specifically deficiencies if any. ( speed ?, easy to
make backups of databases ?, too many incidences ? ). Initially I see
as positive from this solution the flexibility to adapt progressively
to the way that client works.

Any comment welcome.

Thank you
.