DannyD said:I have an OP machine. I used to have a 175. My 2 cents is I don't see where the OP does a better job than the 175. The 175 is less $$. I'm getting another 175. From my understanding if you want OP, ya can buy an attachment from Rick G that'll turn your 175 into an OP machine for about $700. Then take it off when ya want your 175 back. If ya did that you'd have both machines for less than an OP machine would cost.