Hi John,
I had it on my system and to be honest I didn't get on with it, either it was me or I found it not as easy to use as HiFi's Activesky to setup.
So for me if you want a weather engine then HIFI Sim is what I would use, providing they don't turn off the servers in which they did for ASX a few years back,myself and a few others wasn't best pleased, forcing customers to buy another product.
I now use ASN for Steam's FSX and AS Evo for FSX Deluxe and FS2004..yes I have FSX Deluxe on a laptop and FSX-SE on a tower with yoke, rudder pedals and radio stack.
That's my opinion so please don't be swayed by what I have said, get opinions from a few others before you decide to go down that route.