Mine is top-of-the-range. She and Fil look after the DC one day a week with absolutely no problems. In fact the only slight issue is that they are almost too nice and if left to themselves will tie themselves up into bojkers knots trying to work out how to do something with leastpossible disadvantage to anyone else.
Eg. Mil is convinced (based on one fraught bedtime) that it winds the DC up too much if both Pil and DH are here when it is time to go upstairs for bath time. It's really not an issue but now she and FIL shoot out the door each Friday without waiting to catch up with their own son which seems a pretty poor return for a day of DC wrangling.