I'm not to sure how to improve as it does what it needs well. I see Greta have launched on Mobile App which I'm excited about and am looking forward to try this out. If i have to pick on something they have their own ads, which tbh are fine, but a [X] close on these would be handy. Maybe leave a 'Ad icon' to open it up should we wish, but I'm being picky now :-)
Try it you won't be disappointed.