Not familiar with that exact boot,however I have had a pair of LaCrosse Iceman Pacs and never a warmer boot and really not to bulky for pacs, if they are half as good as the pair I have, then do not hesitate to buy them. They are still going strong.
I can't speak to the LaCrosse boots, but if you're looking also at the competition I'd suggest the Irish Setter Gunflint 1000's with the air bob sole. Mine fit great, and kept me warm and dry through a solid week of sub-zero weather and over a foot of snow this year - very impressed.
I have a pair of the alpha lites and they have held up well. The only problem I have had is that my heel moves s around a bit and this some times caused a blister in steep terrain. I tried a pair of the Irish Setter ExoFlex boots and they do a better job for steep terrain.
I have had a pair of 800 gm. insulated Timbermasters(?) for about 5 years now. Fairly light and very warm. If I recall they were around $80 at the time. Very good boots and alot cheaper than some other brands.