I bought TidyCal in part for the date polling feature, only to discover that you've implemented the feature in the most tedious way possible. It's fine if I only have one possible hour per day, but if I'm available within a stretch of potential time--say, an entire afternoon on a Tuesday--for a 1-hour appointment, I have to put those hours in as five separate items.
If you look at ANY other date polling platform, from Doodle to LettuceMeet to Timeful, you're given a time grid and you can use your mouse to select all the times available on a single day in one simple step.
As a result, I haven't been using TC's date polling, because it's just ridiculously tedious. It would be great if you would bring it into the modern era.