There is a lot of competition out there ,some is legit and other not so.
it is always a task to work out who is a potential threat or not.
especially if you have not had to compete in yesteryears.
i have had some quite farcical quotes in last two years to compete with but if a client tells me they have a better quote I state that I want to see that quote .
To compare quotes they need to be apples for apples, cos if the competition is much cheaper there's always a reason!!