I would probably be slightly bias right now as i have an Enforcer but it is a great portable . You can reduce any of these machines to just being a wheelie bin with two motors but really a lot of thought and engineering goes into these machines , in the case of the Enforcer the initial designer has excelled , you know by the clunk of the heavy waste tank lid as it closes on the precision fit gasket that this is a high quality product . And none of the fitting compromise that theme , little touches like a foam gasket inside the fan cover ... incase it buzzes slightly ? the fur lined sleeves on the internal vac hoses ? they did'nt have fit them .. the quality of the bolts and fitting , the stainless brackets on the back roller bars , the unbreakable looking top loading wheels .even the quality of the decal ... all these things add up .
I know Alltec can match Ashbys for engineering quality so i would probably be just as happy with an evolution . I have only seen one Airflex up close and it was pretty beat up with a cracked perspex lid so perhaps unfair but i though it was not quite up there . But again i would be happy to use one . I think the series pro with built in heater would suit my needs .
Heat wise on the Enforcer defiantly get the immersion anyway ... would be up two u if want the built in steam mate also ... convenient to have both onboard at the expense of a little weight and perhaps servicing access . I have an immersion on mine and use an Amtech external also ... you can use both at the same time but even having the immersion on for a while as a preheater increases the inline heat dramatically .