You're read was correct and it was a profitable play. So who can say you were wrong

Like others have said the limp utg isn't an optimum play.
Also, If I'd reached the turn in this hand, felt my opponent was weak and wanted to take a stab at the pot, I think I'd bet more.
The 600 bet I don't think achieves anything and in many cases just pumps-up the pot for the opponent should he hit something or choose to bluff.
If I felt opponent had nothing, then maybe something in the range of 850-1000 might take the pot (or force a mistake)
On the whole though, I think you're comfortably stacked and have no need to get involved in the hand.