What is the appeal of that cross over a purebred Maltese or purebred Poodle? Just the combination of two vastly different coat types sounds like a grooming nightmare to me.
Whatever breeder you go with, you need to make sure that they are doing health testing on the parents. That's not just a trip to the vet and the vet saying they look healthy. It's things like OFA x-rays and eye exams. Check out the national AKC clubs of the respective breeds to see what testing they recommend. I know that Poodles have several issues that should be tested for, including Progressive Retinal Atrophy. Make sure you see hard copies of all testing results.
Most breeders selling mixes of any kind wont be the best or most careful of breeders.
These types of sellers are appealing to those who are motivated by fashion or trends and they are ready to cash in,