The tires are working very well on the recumbent. The tires are a must have if you ride in this kind of weather. Sure you can do without but, why take a risk. Most of my weight is on the back tire and very little is on the front the steering end. I am able to maintain 15-mph on the straight of ways and able to brake and slow down for turns without any slippage. I did find that without any ice it is best to keep them fully inflated and when the snow you have to either take some of the air out or add more air. So far I found that with snow that is past the rims I needed to pump up the air in the back to the max for an Ice breaker effect. the front sets the back crushes and grips. I found that fully inflated tires worked really good with NEW studded tires but not sure about the broken in tires.
When the snow was just blow the rims the tires did well at 70 to 92 percent inflated. I felt very confidant and was able to enjoy my commute on and off the path. The only issue was the deep drifts of snow. I found that with the tires deflated the bike started to slip just a tad but if I hit the drifts with fully inflated tires I noticed some slipping but recovered faster. The trick was having the front low at 50 percent and back full of air. No slipping or it was not noticeable. The tires do make a loud crackling noise but what the heck.
A side note: I used black tape on the schrader valves at the base so that the tube wont slip in the rim. great for pupping up the tires in the cold and any other time.
Update 01/31/09 The front tire needed over 50 percent of air to negotiate most of the rutted rodes. The back tire worked well with 75 percent of the max.  This weather required a lot of fussing with them there studded rubber things. No falls so far and lots of close calls.
Overall the $45.00 for the two was worth it.

Todays commute was fun and muddy. Not sure if I am going to change my studs out yet but I may go for some aggressive treads without studs before I put on my slicks.

Does anyone have a Crystal ball and tell me what the weather is going to be like in the future so I can set my bike up with the appropriate tires ahead of time? 

Oldshacker:

My crystal ball says the weather will be highly variable with miserable days like dead of winter, wet days, windy days, warm days, and even a few calm sunny days. 

Just carry your warm weather gear when it is cold, and carry your cold weather gear when it is warm, and your wet weather gear when it is dry and your dry weather gear when it is wet, and you will be set!

Oldslacker:

Sounds like it’s time to have a couple sets of rims,maybe two, for
your different kinds of tires.
That is my summer project: Get a extra set of, used rims, for, the
studded tires, I’ll be buying this fall. I figure it beats, having to
change tires a couple of times in the fall and in the spring.
As for the weather, I just wear what I usally wear, and carry a rain
suit in my truck bag. If your out and it turns cold, you can use the
rain coat (in dry weather) for the added warmth. This dressing thing
is hard to figure out sometimes, even after 30 years of cycling.
Well time to go for a ride, if you see me out on the bikeway,Wave.
Everyone be careful out there.

You might have something there by having 2-sets of rims. The way I go through rims I might get a group rate. The tires I got I still have all my studs.  Today was so nice to ride. 
Did anyone say SPRING!

The studs have been off a week now and what a change. My speed up and I feel less resistance. It was nice taking off the wide tires. I checked out the studs and found that they did wear down just a tad, the rubber no signs of any ware. I retired the tires and tubes in a plastic bag after cleaning and spraying some rubber protector in and out of them. Some slime for inside the tubes to keep the dry rot at bay.
Now bring on the Spring!

When I put studded tires on the Long Haul Trucker I took about a 40% hit to my speed.  I think the fastest I went even downhill was 25-27, with a regular cruising speed of 12 or so.  Yeah, they slow you down.

But it was worth it to ride on a “wet” bike path for four miles only to find out that it was ice when I put my foot down when I stopped!

soon the studds will be used. The ground has to be colder before the switch.  I still see a few bike commuters, more than last year in Kettering. Don’t let a little snow stop you from enjoying the outdoors.