This is a huge help to BRK (A or B). I have been buying shares because if feel that the market is really missing a lot of hidden value... this announcement of the company buying back a lot of shares was accompanied by the announcement that they lifted the share repurchase plan to a new limit of 120%.
Personally, I wish they would not announce a price... Warren Buffett has stated that the share repurchase would not be used to prop up the shares (he is very right by that... it should be used only to reduce the current share float). However, a number of people think that this is a price floor... it isn't.
I do, however, believe that BRK (A or B) is a strong buy right now (at least while it is still under 100 dollars)... and made more so by the announcement.