Hi
I have been using an alskan mill for about 8 years or so. I used to air dry all my timber for about 2 years or so outside until I moved workshops and lost my free outdoor storage area.
I came across the Sauno kiln about 18 months ago and bought the smaller one.
Building it out of the foam sheets was a bit of a nightmare because it is so fragile and crumbly and we ended up encasing it with fibreglass to a depth of about 5mm or so and strengthening the roof because this is where the door is chucked when the kiln is open.
Drying is a fine art in itself, but with a bit of practice, and careful monitoring I can dry up to 60mm beech in about 5 weeks or so down to 10%mc which isnt bad at all. Most of my timber is now cut to 100/1500mm square edged planks as you can get more in a kiln this way and it is easier to stack. The kiln has been designed to allow up to 8' planks to be put in and about 1m wide boards at the most. It is a bit of a bugger to fill especially on my own and can be a bit back breaking at the thicker sizes of timber.
The only steaming done is at the start when I add extra water and turn the temp up to 70 deg centegrade for five days and the turn it down to 40 deg and open up both vents to allow the moisture to escape. I have thought about putting a vent in the outside wall and running a pipe directly to that from the kiln vent so any moisture will vent outside. At the moment I run a dehumidifier for a few hours a day.
As a cabinet-maker with about 15 years experience I know when I am using crap timber and I can testify to the quality of my timber and so can the other cabinet makers who I have sold some to. So far I have kiln dried yew, oak, beech, silver birch, ash, sycamore, douglas fir, plum, and probably a few others.
I purchased mine from Classic Hand Tools and have good service from them. They were going to start a forum for users of the Sauno but havent started it. This would have been handy for all the questions that needed answered!
So, in my opinion, you only have to steam if you are on a tight schedule and trying to dry your timber as quick as possible as you would be in a commercial yard.
Ps. I know the big softwood timber yards dry their timber in 4 days. Thats probably why there is so much stress and warping in it when you buy it as well as the fact they only dry it down to 15%