Other than the lady with the loaners, none of the group there today had any lightweight machines -- but several are considering options! (the oof! factor is real) A couple have only their one machine but they pretty much only sew at group.
The Bernette is one on my list to consider, I don't think the feet are interchangeable with the 820 but it is something to look at. Eversewn is a relatively new company -- it is not a division of Bernina but was founded by a member of the Bernina family. When they first came out, a lot of people were raving about them for quilt camps or other portable/class situations but I haven't seen much lately.
Others on the new list that meet my general requirements are the Janome 2212, a couple Singers, a couple Brothers, and the Juki HZL-27Z. All have pluses and minuses. I have no real brand loyalty.