I have a problem with buying tools....I have the K3-k4 and K5....the K5 is awesome, a little more convenient, but the other two work fine too. I also have a biscuit jointer, I really only use it for cabinets, for putting on the face frames, and then only one side ( I use a router slot on the plywood side). I have read a couple of times about how eventually you can see where the biscuits are, because they swell over time in the created void and it shows through the wood. Now, I have to tell you, I used to biscuit a lot and I have looked at my joints on things up to 20 years old and I don't see anything, but I read it on the internet, so it must be true!!!! lol
On a couple of wood working blogs the Kreg joints are maybe looked at dimly because of the tell tale holes....but it's really easy and considerably quicker. I don't even use glue anymore on the joints. With plywood having such paper thin top ply, it is too easy to sand through, and if it is not glued, I can replace that panel very easily.
I am from Iowa and so is Kreg...it's in Huxley and very much a family owned business. The only downside to Kreg is their prices...they are proud of those products! Overall they are good products well engineered, but they have some quirks too. As far as the strange holes, just learn how to hide them as best as possible, and for the ones that would show, use a different method of joinery.
Just IMHO....