I would say if you're doing 2mg once or twice a week then you shouldn't be in that much trouble with them as long as you keep to that. Shit can creep up on you really quickly! But IMO, if you're using responsibly and to medicate anxiety or whatever it shouldn't be as much of an issue as if you were just doing it to get a dunt.
I developed a tolerance to etiz fairly quickly, and it doesn't really seem to have diminished even though I've not used them for a month or so. When I started, 4mg would have me way way too far gone, but I had a bit of a problem with the stuff early last year and could wind up taking 30-40mg going up to 80 just to get an effect until I ran out, got withdrawals and swore never to get that way again cos FUCK that was the worst week or so of my life. Packed it in after that for a few months, but even now with occasional use maybe twice a month I still have to take around 10mg. I do think cross tolerance with alcohol could be an issue for me as although I don't drink as much now as I used to, when I do I have to drink a lot to get the same kind of effects I did when I was fourteen and plastered on four bottles of Becks.
Missus reported same with her diaz prescription. She was started on 2mg tabs for anxiety once a day or as needed, and she's not one to abuse drugs, legal or not, and she still said she found herself needing 8mg of that to do what 2mg once would. Don't think she takes them now unless she's absolutely mindfucked.
Just got some Intaas pellets, had a couple, see how it goes. Feeling quite nice already and the idea of a cup of tea, a bit of gaming and a nap will make my day, pretty much.