Counterspell. Has anyone even seen it used in their game!?

[Arravis]

In our campaign we counterspell all the time, at least when fighting casters. This is a pretty lengthy and ongoing campaign, and we're at 19th lvl. The opponents we fight can dessimate the party if one of their spells goes off and a few bad rolls are involved, so counterspelling becomes critical. We have both a sorcorer and a wizard in the group, both have all the counterspelling feats available and one even has a Ring of Spellbattle (from MoF). Ussually, during a battle, one of the casters will take up "counterspelling duty" while the other casts offensively. That way we can try to shutdown the most powerful enemy caster while keeping our offensive power pretty high.

Keep in mind, all it takes for an opponent caster to destroy the party is one Wail of the Banshee delivered at the right time and most everyone keels over (we're often fighting Thayan Wizards with the prestige class, so the DC's are pretty damn high). Anyway, for us, counterspelling is one of the reasons we're able to survive these encounters at all.

 

[freebfrost]

Never once from my players.

I have used it for NPCs a few times in my last campaign, but only with NPCs that were fairly high level spellcasters and had some spells to spare.

I am considering expanding on the counterspell rules to allow spells of an opposite energy type (fire vs cold etc.) and the same or higher level of the spell to be countered to be used to counter evocation-type spells, but haven't fleshed that out yet.

 

[Gromm]

Its never come up for me personally. Against most wizards you would have to go first before they cast haste, or you'll lose out. Even then having the right spells memorized is pretty rare.
With the FR feats you might stand a chance of having the right spells, and as long as you could counter his haste attempts you'd probably do pretty well. If you cast haste and then readied a counter you could, in theory keep the other caster out of the fight and still manage a spell a round yourself.