My sorc is working on getting the mines - few more levels - and I already have the fire rune from the Mage's guild. I use it in AvA and in PvE and I really like it. I also want to get the one from the fighters guild but hadn't thought about the one from the Undaunted.
I am building my character as a hunter so the traps work out well and have high hopes for the skills that might come from Thieves Guild and the Dark Brotherhood - hoping for some sort of poison trap or tossed potion of poison.
I know in AvA that they can't see the traps since I took a stealthier out of stealth by guessing his travel route and throwing a Fire Rune down - it was great to see him trigger it a few secs later - if only I had the mines and the Fighters guild trap stacked on top of it - it would have been glorious !!! :) (and throwing it down didn't take me out of stealth - added bonus).