I urge you to make a decision regarding this agent. Once they write an offer, they are your agent on that transaction. If you don't have confidence in their skills and trust they are highly competent, get an agent who is.
Think about it this way, if you are spending $500,000 for your next house, would you hand that to this agent in a briefcase full of cash and trust them to take excellent care of it, keep it overnight or for a few days while you are away? If not, why trust this agent with what you will be spending that much money on?
There are lots of very nice agents, but not all "nice" agents are great agents. Look at Find a Pro up above, read several of the agents in your areas answers, their blogs. Check out their websites and interview them.