Quality of GPS on HL6528-G

Hi, anybody has used HL6528-G module GPS, will anybody share his experience with it. I recently used Simcom SIM808 GPRS+GPS module, I frustrated with its experience. GPS accuracy is very poor(used active antenna for it, in open space, It has hundreds of meters of error). I am planning to switch to the Sierra, and want to confirm its accuracy. Does it work properly as specified in specifications? Does it provide accuracy as specified in specifications? How is the overall support from Sierra for development? Thanks.

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