How reliable is it? I ask because I can't use the GB2 Mail feature, as it does not mail anymore. Will it hearth and deposit into my guild bank, then go back to wherever I am farming?
yes that is how it works make sure your hearth is on the same continent or the bot tries to fly across the ocean and dies.
you can make a simple Proffbuddy profile to handle mailing (it's allot faster too) or deposit in gbank if you want to. example profile attached.