Google it man! You'll get tons and tons of positive reviews on the 350. It's been around for years, it's been reviewed to death, you can get all the feedback you want by reading user reviews on amazon.com for example.
It's a good, basic and solid GPS device, if you're willing to do without some of the more advanced functions such as road avoidance, multi-destination routing, route optimization, etc.
What is it you are looking for or what is your application? Sensitivity isn't typically a big deal with auto GPS devices (these days at least).
I just want to make sure it can get a solid lock or signal in fringe/rural areas or during bad weather. So sensitivity isn't an issue for all auto GPS these days even for those units without SiRF chipset?
That is pretty much right. GPS isn't impacted by weather-- at least not "weather" we think about happening on earth. It was designed to use frequencies that are not impacted by changes in the lower atmosphere such as rain, clouds, snow, etc. It can be impacted by thinks like "space weather", but that is fairly rare.
Likewise the earth is equally covered by the satellites, so your signal will be just as good in rural areas.
As to the SiRF chipset-- a couple of years ago it was the undisputed leader in consumer level chipsets. A few years have gone by and others have caught up. A couple of years ago we would tell people to consider devices that had a SiRF chipset. It is still a great chip, but others have largely caught up in performance.
Sensitivity can still be an issue in some areas, such as "urban canyons" like NYC where your sky view is obstructed by buildings and the signal can bounce around, and in those cases there are a few devices that will have a little bit of an edge over other devices, but the difference today isn't huge.
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