Any featherbed will work well in colder climates.
Any featherbed will add some warmth to the bed, so you may want to use different type of mattress topper in warm climates.
Most feather beds rarely shed, you'll only see a feather or two a week.
Feather beds are better because they are organic, therefore are less likely to cause allergies. Additionally feather beds are more comfortable and have the option to be adjusted in case of getting worn down.
You don't need professional cleaning for most feather beds, but it helps if you can afford it.
Some feather beds are portable but transporting them may not be all that practical since they're not like sleeping bags or cots.
Feather beds have come along way now with stitching that keeps the down in place. The down does not hurt when you roll it up as it doesn't poke through as much as the feather and down mix, or nearly as much as the older feather beds.
You can buy zipper, or velcro covers for feather beads for extra softness.
Yes, because they have thick fur and are built for colder climates.
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You can buy feather beds at most well known dept. stores such as Sears, Macys, ect. You can also buy them on Amazon.com. Yes, you can buy cushion feather beds.
Most feather beds are very comfortable and will certainly increase your comfort.
Because the higher you get the colder it gets.