I used to own the Glo.
When it comes to sluggishness loading and responding to books, I've found that the Kobo is very efficient at loading and page turning on kepubs, moderately efficient for epubs, and poor on mobi. If you want your Glo to feel more responsive you should convert your epubs into kepubs in Calibre. That is what I did with the epubs that I bought from Books a Million.
As for not recognizing touches, that is a bug that I've seen in both the Glo and Aura HD. It sometimes happens, and I don't think that your device is defective.
The newer Paperwhite is more responsive. But before you upgrade, you should try reading kepubs to see the Glo perform at full throttle. It's also been my experience that typesetting and font rendering also looks better when the Glo is displaying kepubs as well.
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