I have been use a Pepe Tools Touch a Matic wax pen for about 8 years.
I use if for sprueing and for build up modelling. It appears a little
flimsy but It has continued to work without any problems for all that
time. The temperature control is a little finicky. I find that for
all the waxes I use from soft modelling waxes to hard injection and
carving waxes I am working at the lower end of its range of control.
I like the touch switching on the pen. It is much more convenient
than a foot switch. I have a fair selection of tips but I find I do
most of my work with three of them.