My $0.02 on USPS Priority Mail
Its deff a decent service, but on shipping higher end items their insurance is more costly than Fedex or UPS.
Also - one 1-5 lbs they might be better priced than Fedex, but on heavier boxes Fedex is much cheaper.
With Fedex, its usually 1 Biz day deliver in the tri-state area.
With Shipping to CA, or accross USA, Priority Mail is faster