I love Seckel . Sometimes called sugar pears . Brownish skin smaller size but will set fruit without another tree to pollinate .Seckel will ripen on the tree. Bartlett is sometimes self fruitful . Depends on climate . Bartlett is a longtime favorite of growers . Needs to be ripened off the tree .As a kid the Seckel were my favorite .Thanks. I'll see about getting some scions this weekend. Any recommendations? Are you familiar with either of the 2 varieties I mentioned?