Review (1/5): I was sorry
I ordered a replacement set of shaver heads "Norelco HQ177," advertised available at $28.99, from Goodman's. Days later I received Norelco HQ8, advertised at 24.99, with an invoice stating that "HQ177 no longer available, Upgrade to HQ8." The HQ8 will fit the Series 77 shaver, but it is not a recommended replacement by Norelco. I tried the HQ8 head. Each cutting guard has reduced openings of about 40%. It is impossible to get a close shave with this head. My three year old heads are better. Note: There was no adjustment for the difference in advertised price of $4.00, by Goodman's.