Formula wise, Exaggerate is identical to Glam Eyes. Both eyeliners are super black, glossy, and very liquidy. This eyeliner takes a while to dry so I have to wait around 10 minutes before applying mascara. Rimmel's eyeliners last around 6 hours on me and then they start to fade and I have to re-apply them. I've never found an eyeliner that lasts all day so that isn't a huge issue for me.
I find the felt tip applicator of Exaggerate really hard to use as it's simply too wide and not fine enough. In order to get the eyeliner look above I had to thin out the wing with a Q-Tip dipped in eye makeup remover. I've actually been using an old Glam Eyes brush to apply the Exaggerate eyeliner as I just can't deal with the amount of cleaning up the felt tip requires. I will use this eyeliner up but I won't be repurchasing it nor would I really recommend it.