Just snagged an 81x and 85x cheap, will probably be dropping them in my LP baritone as soon as Warmoth gets the neck to me. Will update then.
In the meantime I've heard someone with an 85x in the bridge (in a mahogany Agile baritone deal) and it sounded fantastic. A lot warmer than regular EMGs and took up a ton of space, and cleaned up very well.