The IAH UA Club in E isn't bad. I like to hideout on the third floor, maybe have a shower and usually occupy one of the tables by the snack bar. The actual bar is on the second floor, so if you want drinks you'll have to go down there. While they have improved the UA Club experience over the past year, if you're used to the LH Senators Club you will be soundly disappointed. No self-serve soft drinks but the snack bar isn't too bad. Usually there's a selection of fruit, some kind of chip/nut/choc/trailmix snack, coffee, water, tea, hummus, pita bread and a soup. For the longest time, they only served a butternut squash (or so it seemed) across the UA Clubs in ORD and IAH. Now they have more interesting soups that seems to change more frequently and taste better - I've actually been enjoying them.
Don't know how the KLM lounge is in comparison but if you're looking for food, I always have a nice meal at the Pappadeaux Restaurant in E.