Yes and no. There is an app for iOS, so you should give it a try. I don't use it on my iPad though. I read longer texts on the iPad with LingQ, but I prefer to create the LingQs first using my laptop and then read on the website using the iPad. It is pretty good.
I do something similar to this, though why do you read stuff on your iPad through the website and not the app? The reason I still use my laptop for my first read is that is that you can't create lingQs for phrases (i.e. multiple words) on the iPad.
The app is too tedious. It takes forever to load and it crashes constantly. When reading a long text, if I want to change the status of a LingQ, half of the time, all of the words disappear from the screen for a second or two before reappearing (assuming the app doesn't crash). Also, it is very difficult to enjoy reading when every time I want to look at the hint for a word, a bar comes from the right side of the screen and covers half the text. The website is better in all of these respects, at least according to my preferences. I prefer the old version of the app.
Oh yes, and I forgot to mention that when holding the iPad in landscape mode, we are forced to look at a list of lessons on the left side of the screen (for some reason). The text that we are trying to read is apparently so unimportant that at times, it only gets given one third of the screen.
I prefer using a tablet for most of the activities. It's perfect for reading in bed. And in case you are wondering what kind to order, make sure you consider android tablets too, not just overpriced ipads :-)