The Bosch GST 160 CE Professional has trigger variable speed control. Along with dial speed control also. The dial has control and the trigger will adjust up to the maximum set on the dial. Not sure about their other models. Mafell have made the outer pendulum action and blade guide and roller support obsolete. So no friction is ever created on the blade causing heating. And no parts in that area to wear out. Quite clever really.
Thanks very much for that Ryluer. Sorry, I must have missed your rely about thas - sounds perfect, and Bosch too. I'll take a look. Amazing that its' so hard to find!
My Bosch GST 150 BCE has constant electronics as well as variable speed trigger and speed dial & will cut up to 150mm, can be found for £130 or less. http://www.bosch-professional.com/gb/en/gst-150-bce-23294-ocs-p/