I often browse and post to the forum with an iPad. There are two site features that make it difficult, one old and one new.
First the old: when typing a post, if you click one of the tool ribbon formatting buttons, the Buy/Download/Products/Learning/etc navigation ribbon jumps down to the top of the screen, and stays in that relative page position (does not stay at the top of the screen when scrolling, it scrolls with the page content.) What that means is that by the second or third time you use a formatting button, that navigation ribbon is stuck on top of the formatting button ribbon, making it impossible to use any of the formatting buttons. The fix is to close the keyboard, which redraws the page with the navigation ribbon at the top of the screen, and it stays there while scrolling. You can then scroll the page so the ribbon is out of the way, then tap on the edit field to re-open the keyboard, and the ribbon stays put relative to the page until the next time you tap a formatting button. Basically, the navigation ribbon jumps when using a formatting button, and does not stay at the top of the screen when the keyboard is open.
The new problem is with the smiley icons: a recent change has limited the number of smileys that appear in the edit dialog. If you click the ellipses to show more of them, there is a pop up window. The issue is that the smileys are very small and difficult to tap. If you pinch zoom in, they do get bigger, but the code re-calculates the pop up position relative to the zoomed size. As it does so, the pop up window moves up out of the screen's view. Scrolling the screen has very little impact on the pop up window's position, I often have to scroll all the way to the top of the page to be able to see the pop up window.
In both cases, the code appears to be doing some automatic page element position calculations, but they don't quite work well on an iPad. They don't make it impossible to use on an iPad, but they sure do make it inconvenient and aggravating.
On the plus side, I like how the Karma count is shown next to each post. 8)