I bought 661 EVO's when i started back a year ago , i wore them occasionally but not all the time . I ride trails , basically technical XC , i do downhill runs ... everything . All on the same AM bike .
Last november on a nightride i basically put my knee down on a slow corner as i had climbed the inside of the trail wall and i was going to wash out . This resulted in an infected chop to the bone which put me in hospital for 4 days and off the bike for 7 weeks . I always wear them now , every ride , i dont notice them there anymore . The 661 evos are amazing pads for riding in and i do 2-4 hour rides 3 times a week . There are new 661 XC Lites out now , they might be worth a look if you dont want the bulkiness of the EVO's.