This sort of tool would be nice for PoC - but if you're using it for production anything and have any customer information (or really, any information of value) saved in that database... it would be terrible - even off an R/O connection.
Just a little clarification: the architecture is 3-tier, databases are not directly exposed; the software includes an authentication layer and firewalling rules: you have fine granularity on tables & columns access per user.
