Most people? I haven't really seen many say that. There are 12 different pairs of stock tips included (5x standard, 2x triple flange, 5x gel-filled isolation). You should be able to get a good seal with one of them. If you can't, Sony Hybrids have the same length and bore size.
They really are excellent earphones. I have both the Gratitudes and the Yao Solars (original model, rebranded as the Gratitudes) and they're excellent. Very smooth, enjoyable sound with a small high-mid, low-treble bump to keep them from sounding too dark. The best word I can use to describe them is "lyrical". A good, quick review can be found in the Summer Buying Guide here:
http://www.head-fi.org/a/2013-head-fi-summer-buying-guide-introduction
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how your compare gratitude to tenore and re-400 ?
The RE-400s are a touch smoother in the treble, the Gratitudes have better bass. Detail levels are quite similar though a slight edge goes to the RE-400s.
The Tenores can't even be considered here. Both the Gratitude and RE-400 are better headphones by miles and miles and miles. Like, it's not even remotely close.