Two issues I've noticed.
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When using the cooldown overlay, ultimate timers are completely broken, since ult level, cdr and ulti hunter are not added to the calculation. For cooldowns, cosmic insight is not accounted for. This leads to inaccuracies that actually sometimes make it worse to use it than to not use it.
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Not sure when this occurs, but if the timer shows up on league natively (the white/yellow timer on a camp) the overlay doesn't use that information to update. This means information can be inaccurate, and since it's an overlay over the usual timer, it makes it really hard to see the usual timer, which makes this also sometimes worse to use, than to not use.
I love op.gg, but I can't really recommend the desktop with these overlays at the moment because of these reasons. When this is fixed, please tell me :)
