The Pentax DA 55-300mm has an average review score of 81%

Score (%):
Pentax SMC DA 55-300mm f/4-5.8 ED - Review
The Pentax SMC DA 55-300mm f/4-5.8 ED is a viable choice when it comes to an affordable long range tele lens. The resolution figures are pretty decent and in field conditions it shines with a snappy contrast characteristic
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63

SMC Pentax-DA 55-300mm f/4-5.8 ED Lens Review
This is the ideal moderately priced long zoom lens for Pentax cameras. Compact, well balanced and well made and offering a very useful range of focal lengths.
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90

Pentax 55-300mm f/4-5.8 ED SMC DA
This is an excellent lens for the money, generally sharp and contrasty at 200% at all tested focal lengths, including 300mm. I found it to be much sharper at longer focal lengths than the Pentax 50-200 and the Tamron 70-300 tele zooms that this lens replaced.
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90