Making changes in caregiving help is common. Always do a little reference-digging before you sign a contract with a home health service, switch to a new company, or hire a home health aide from the "gray market" of independent providers.
Start by asking for at least two references -- and be sure to call them. Here's what to find out:
How recently were the services rendered?
What was the care situation, and what kind of help was provided?
What did you think of the quality of care provided?
What did you think of the person/people who helped?
Was there a lot of change in staffing, or were the same people consistently involved?
Did you have any problems, and if so, of what nature were they?
Are you still using these services, or has care ended (and if the latter, why?)
What were the caregivers' names?
If it's a small company, also check with the local Better Business Bureau for any complaints against it.