What kind of tools miners are using today to evaluate the value of mining device

[HorseRider]

I know TGB is quite popular.http://mining.thegenesisblock.com/
 is there any other choice?

[Perseus353]

That's not a very good one -- for one I can't set an initial mining date in the past; it's mathematically impossible that difficulty continues to increase the way it does; and of course it does not take into account the (mostly unnknowable) course of the price of bitcoin.

The explosion in value in the last week has significantly brought down break even targets.

[MaxBTC1]

That's not a very good one -- for one I can't set an initial mining date in the past; it's mathematically impossible that difficulty continues to increase the way it does; and of course it does not take into account the (mostly unnknowable) course of the price of bitcoin.

The explosion in value in the last week has significantly brought down break even targets.

Pretty much this ^