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My suggestion would be ... Make sure you find someone with exactly the combination of M90 revision and PFlat4 revision you're thinking of buying and check they get acceptable results, before you buy.
William Optics is natorious for subtally changing their refractors and field flatteners without calling them a different name. At last I knew there were 3 revisions of the M90 and some worked with the PFlat4 and some didn't.
I have a M90 second revision which was supposed to work with the Flat v3, but it didn't. I sold the Flat v3 and bought a Borg DGL. The combination of M90 rev2 and Borg DGL produces perfect results.
For me it took a lot of time and some frustration and various attempts before I got a combination which worked. I would be hesitant to say buying a william optics scope is going to give you that "it just works" winning ticket. There seems to usually be fiddling involved to get the right combination of things to produce perfect images. They are built to a price not perfection. Their construction is good but are let down in some areas.
If you want "it just works" I'd be going Tak, TeleVue, Borg, etc (with field flatteners), or higher priced WO like the FLT132 which from my experience, with it's field flattener, "just works".
I know it's hard to go past the M90's for their price though, hence I ended up with keeping mine and am now happy with the combination I have.
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