I think Xtenex are even a bit more convenient. Elastic, and they turn any shoes into slip-ons. I bought them first for my running shoes, but now I have them on all my work shoes too.
Are they awkward if you need to adjust the lacing - I like tying my laces each time, then I can adjust for when I have swollen feet (hot weather), the size of sock I'm wearing, the activity I'm doing and what have you.
http://www.xtenex.com/