I ship everything PP. I have only had about three issues in the hundred or so saws I have shipped in the last 1.5yrs, and two of those were in the last month. Otherwise, it is usually a couple of days slower than Priority and the cost is about 1/2 the cost of Priority, UPS, or FedEx. I will say that I bought some rings last week. They shipped last Tuesday and started out 150 miles south of me, went nearly all the way to the other end of Florida, and then arrived at the house on Saturday. I could have bicycled down there quicker.
FYI, tracking is now free (as of Monday) on USPS Priority packages. It's not worth much, but it's better than sitting in the dark.
The local PO lady told me that tracking is now free but they raised the postage prices.