I put it on my iPad a while back. To be honest, I still find myself using safari most of he time, unless I remember to use the app.
I'm not sure if I have the HD version, but I do use taptalk on my ipad. ; My understanding is that it gives you better functionality when crossing multiple boards. ; Since I really only use it for TMIP then there is no reason to need the hd version (for me at least) Sent from my iPhone...
I tried it, and I'd say save your money. The one thing I was looking for was the option to not have forum photos shown much smaller than in a web browser, but apparently the HD in this version doesn't apply to images.