The Pentax DA 18-135mm has an average review score of 67%

Score (%):
Pentax SMC-DA 18-135mm f/3.5-5.6 Review
The biggest problem of the lens is its pricing which is simply not in line with the optical performance. Better consider the Pentax DA-SMC 17-70mm f/4 SDM instead which is a far better lens.
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43

SMC Pentax-DA 18-135mm f/3.5-5.6 review
There is a lot to like about this lens and in a practical sense it gives a good account of itself. There are design compromises that have lead to drawbacks, but often it is a matter of matching a lens design with the desired application.
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80

Best travel lenses: 8 tested: Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR
The Pentax resolves good centre sharpness across the focal range. Fringing at the extremes of the focal range is noticeable at the edges.
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60

Pentax 18-135mm f/3.5-5.6 ED AL [IF] DC SMC DA WR
For the price I paid for it it is an amazingly well blanced lens , quite sharp and it almost never flares in any light.
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85