Same here, I stayed in March for one night on the cheapest of cheap rates, and was upgraded to a huge room with dining area etc. The hotel had pre-reserved the upgrade, along with a letter from the manager. The staff were very friendly and helpful, and the lounge was pleasent - great view to watch the sun go down.

All in all, one of the most friendly hotels that I have stayed in recently. Only negative is the traffic along the interstate to get to the hotel.

I would take the chance and go with the cheap rate(esp if you are paying). If you don't get the upgrade, you will get access to the lounge anyway, but my hunch is that the hotel will do all it can to upgrade you.