I would never WASTE a meal in Epcot on the Electric Umbrella, free drinks or not.
There are so many wonderful CS places, starting with Sunshine Seasons in FW and all of the International choices in WS.
Personally I like Electric Umbrella, however in my opinion you can get a better Quick Service meal at Sunshine Seasons which is located in the Land Pavilion by the entrance to Soarin and they also offer refills on their drinks.
The food is no different from any other WDW burger/nuggets counter service. Burger, nuggets, basic salads, that's about it. No toppings bar. If you like those, it may be worth it to go just for the refills on the drinks, but you can get that at Sunshine Seasons too and they have better food.
Good to know if all you want is a soda (and not from Club Cool). Does Sunshine Seasons have free refills too? I agree with the PP's here the food at Sunshine Seasons beats the EU hands down!
We ate at the Electric Umbrella and I thought it tasted fine - typical Disney hamburgers. Yes - drink refills were free. We split the hamburgers in half and were able to feed a family of 6 lunch for around $50.
Just the smell of the food in Sunshine Seasons/Land pavillion made my families stomachs turn. I remember remarking to my husband that the Garden Grill was supposed to be good and was difficult to book but that I am not sure I could even eat there since I had to smell the stench coming off the bottom floor restaurant!