Let me echo what Paul said about K3. I am a miserable sod (even Paul said so), and I tried IRIS for a while simply out of tightness.
I ended up paying for K3, and haven't looked back.
I too have tried the OAG method, and like almost all the others decided that a separate guidescope was the ticket.
The best purchase though was a decent set of guidescope rings, in my case a aset of Losmandy DR125's.
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