Following what a company's executives do with buying or selling a stock is not a bad idea for sure.  But I'd also think that before doing that ONE would need to know and understand why they're buying or selling their own stock.  Also look at what the stock itself has been doing for, say, the last 1, 3 and 6 months.
Stick and forget when buying dips.  Is this good or bad?  I'd have to believe that would depend a lot on the parti...