Not sure what about other AIOs but I do a fly sparge (i.e. 1-2" of sparge water over the grain bed) with every batch on my Grainfather. After mashout, simply lift the basket, and as the liquid level drops let the top filter plat come to rest lightly on top of the grain bed and then start the flow of your sparge water (I feed mine from a gott cooler). Adjust the flow of the sparge water so it matches the flow through the grain bed and let it rip. If your crush is right, and your grain bed is setup well, you have a nice slow, even sparge. I suppose you could achieve the same by pouring sparge water from a pitcher on top... just have to keep up with the drainage to the liquid level stays high enough.
FWIW - I've been using a Grainfather G30 110v for years, and about 100 batches now... and love it. Especially the ability to brew indoors, year round. That, easy cleanup, and compact stoarge make it (any AIO, electric) a no brainer if you have the funds.