How many of you ride on the Felt seat thet came with your bike? I have heard/read a few comments that they are not very good and that most riders change them out.
I have been riding with my Felt seat but after about 40 miles it starts getting uncomfortable.

I don't want to waste a lot of $'s on a different seat but there seems to be no way to try-out seats to see what might be better. there is a varied selection of widths and amounts of padding. I have heard that the trend is away from the thicker gel saddles, is this true?
I was looking at a Stella San Marco that seems to be well thought of but, it is very similar to my Felt seat in shape, width, and padding although the Stella maybe a little more flexible.

Anyway how does one find a seat that works for them or is it just trial and error?

After one ride I swapped my Felt saddle for the San Marco Concor from my old bike. I always liked the cantle (or spoiler) on the Concor and the old Turbo, for climbing.

Now that the Felt saddle is on my fixie I think it's a pretty decent seat, but for a long ride in the mountains I'm glad I switched.

The carbon reinforced saddle on my F3C is the most comfortable one I've ever had. It looks like it would be a real ball buster but it somehow works. I see them on ebay from time to time where people practically give them away for like $19.

I like 'em. Feel like an SLR to me.

I have the Carbon one that comes on their track bike. I like it more than pretty much any other saddle out there

I have used my Felt saddle for almost 2yrs now. It gets really bad when stage racing. Luckily, after I did 5 days in a row of racing and another 13hr week of riding, my ass is used to it now (this was last June/July).

My new bike has a Fizik Arione and it's a LOT more comfortable than the Felt saddle. But, I can still ride the Felt saddle for 100+mi.

Not sure if it was the Felt saddle on my new F2 (versus my former Fizik) or the inevitable re-positioning on a new bike... but I was raw after two weeks and three-hundred miles. I didn't give up my workouts (neither on the bike nor at the gym)... .and it took about a month for me to acclimate or toughen up to the new saddle (and/or new positioning).

Two months into the new F2, no problems with the saddle. It's fine.

I'm one who is constantly searching for the ultimate saddle, and the best way to do that is to buy them used on ebay, use them for a while and resell them. I almost always get back what I paid for them, sometimes a little more. It's also nice to have a few extras on hand, sometimes you like to switch back and forth between saddles.