Hi nwboomer,
The Coleman 105 model is a litttle workhorse of a spa!
I've sold many of them over the years and it's just a great spa.
In a North Dakota winter that spa should run you about $20.00 to $25.00 per month in the coldest months to run.
The great thing about Coleman is we don't use different parts and components for our basic level spa's as some companies do.
Their are some differences however with the 100 series spas
At this point in time the 100 series doesn't have the galvalume steel frame. They still have a pressure treated wood structure.
The warranty is differerent on the 100 series. But like I said before this is a little workhorse of a spa, and has had very few service issues over the years.
The price they quoted is below the best price our store could do for that spa, so.... if the spa fits you, BUY IT!!!
I beleive from what I've heard over the years that Maquis builds a very good product as well. Wet test both if you can.
Take care, let me know if you have any other questions on th e 105...
Spahappy