Hi I've had the m80 just over two weeks now and I love it. Great battery and 80watts for that price. Couldn't beat it.
If your buying one check with the seller that it is the newer version with v006 showing up when reset as this version fixed the temp control and some hardware changes.
Yes you don't have to use the temperature control from the main menu you can select wattage mode, mech mode and temp mode
I personally don't use temp mode and didn't buy it for that purpose.
If it's a temp control mod your after I wouldn't recommend this but if its a cheap box mod your after with great battery, supports down to .1 ohm and more than enough power then I'd reccomend this 100%