Hi James,
Very interested to read your feedback.
I was in exactly your position (Stihl MS361) a few months back, but opted for the Small Log Mill instead to maximise the cut. With a 20" bar, I can just eek out 18.5" with the Mill post clamp hard up against the oil tank. Out of interest, what sort of cut can you achieve with the Alaskan?
My first impressions of the Small Log Mill have been very good (photos to follow!). In fact, it all but paid for itself in a single hour when cutting up an oak log for use as a mantel piece!
Downsides:
Occasional lack of parrallelism due to my over-eager support of the power head - user induced error that you probably wouldn't get with the Alaskan, given that the bar is supported at both ends.
Some degree of "gouging" or blade drift, for want of a better term, towards the end of the cut, whether wedged or not. Not a big problem, it either means cutting off the last 5-6", or dressing it out of the finished board, i.e. planing off more than you might otherwise need to.
Positives:Totally outweigh the negatives!
Hugely satisfying to use.
With care in setup (vital), you can achieve very impressive results, in terms of surface finish and squareness (if cutting a cant/beam). I was chuffed to bits with the mantel - I spent a good while setting up my improvised guide rails, but the end result was square to well within 1 degree; no exaggeration.
Chain sharpness and profile are also key to success (thank-you Rob!!). I have no regrets having bought Rob's 12V chain grinder plus guide assy; it has transformed the sharpening process. The chain now cuts faster, smoother and lasts longer between sharpening - primarily because all the teeth are the same length and of exactly the same profile so they all cut and wear evenly.
All of that said, if I were starting out again, I would choose a bigger power head (min MS460, most likely MS660) with either a 25", or 30" bar and an Alaskan Mill; it's just too addictive!
Best,
Andrew