Roffer's
We use it for tournament fishing. They are in touch with boats on the water to ground truth the water location and fishing reports. They follow the water, know which way it moving, color, current, etc. They do a good job dealing with cloud cover.
We have used multiple services at times and could compare the products. Roffer's is head and shoulders above OSS and the other low-cost or free services.
Not inexpensive worth the money. We buy a package for a number of sat shots and use it selectivly.