They work well. I have not ridden them over 50 miles. I am 6' 185lbs, wear 33 waist, am average shape and the size M fits nice and snug. A size L might fit more relaxed. I would not buy super cheap bike shorts, they don't not keep you in place. These do.
Of several different brands of bicycle shorts I have purchased, the Pearl Izumi Men's Quest are by far nicest and most comfortable shorts I have found in the lower to mid price range.
Good value for the price for cycling shorts I wanted for moderately long road rides (3 - 6 hours in the saddle). Panel material is robust, and padding provides a firm and stable foundation. Ordered large size based on measurement recommendations on the web site and feel constricted in the crotch - will be exchanging for XL, but everything else (waistline & legs) felt fine. Maybe add a little extra room down in front?
I have purchased bike pants at my local bike shop for over 30 years and usually pay at least twice what I paid for 2 pairs from REI recently and same quality as I wear them everyday on my 30-40 mile ride.
I use these in warmer weather by themselves and under tights in cool weather. As with most Pearl Izumi gear they are well made and seem like they will last a long time. I am a 32 waist and these fit me just right. My only minor complaint is that the padding is a bit thicker than I like.
Bought these as previous year's closeout, so they were super cheap. They fit well and do what they are supposed to do. They don't creep, or move too much. I would be willing to pay full-price for my next pair based on how well these worked out.
Like all things in life, you pay for your shorts in one way or another.
I used to cheap out on these and then paid in saddle soreness.
Do yourself a favor, and throw a couple bucks towards your shorts. Your butt will thank you.
Just purchased my second pair to have another pair. Use so far has been completely on a trainer, riding up to 2 hours so far they are very comfortable. No movement, chaffing or soreness so far. Breathability difficult to determine without air flow but I plan to use these on extended outdoor rides as well. Solid.
My wife purchased these shorts for Christmas, I needed a pair for spinning class. I had a old pair of PI and they worked well. The first time I used the new ones I noticed a big difference. Extreme comfort. no chaffing or soreness. Keeps me cool for the most part. These shorts exceeded my expectations, I would even consider using them on 40 mile rides.