The Syntakt was a little warm after I used it for the first time for a couple of hours, but not as warm as I thought it would get after reading reports about this issue. If the warmth of the machine wasn’t mentioned in these threads I wouldn’t have thought twice about it.
Some Behringer machines can get pretty hot. My first mixer was a Behringer Xenyx 1202FX and it got so hot I was afraid it could become a fire hazard if I left it on too long. Apparently it’s normal for that mixer to run really hot.