I was diagnosed in May with bilateral DCIS, HR+, grade 3 in the left, grade 2 in the right. I've opted for bilateral mastectomy but it took me awhile to get to that decision. My oncologist advised that the lumpectomy could leave my left breast very deformed. I started thinking about mastectomy as a result and then read here that some women regretted not having mastectomy because they had a recurrence. That sealed the deal for me. My mastectomy is scheduled in a couple of weeks and will follow up with a DIEP flap procedure.
I would add that I do not carry the BRCA gene but do have a family history with a maternal aunt, paternal aunt and a first cousin.
Best of luck with your decision!