I have sirius weather with Raymarine equipment. The weather features, like tracking storms in real time and getting updates on buoy readings and offshore noaa reports through the day is solid and nice to have and we've used it to track and steer around thunderstoms.

The SST feature is pretty weak on Raymarine (no chart overlay detail for example) and does not compare to Roffer's or Ocean Temp or the others. Raymarine claims that upgrades are coming, but I don't know when or if that's accurate.

If your main goal is to use it for planning and running with SST I would not buy this right now. I kept my subscription to Ocean Temp.