I confess I have enjoyed a love-hate relationship with Alpha for a number of years for a number of reasons.
Against - I have met too many churches (leaders and members) who when asked about evangelism blithely tell me that the 'do Alpha!'. This, once a year, offering apparently absolves them from entering into relationship with those around them.
For - It's a 'known' brand name in terms of being an introduction to Christians and people appear to be comfortable with the whole event. The positive attitude towards it is a great help in getting people to come.
Against - I come across a number of people who run Alpha courses which are in fact Alpha in name only. I attended one course where the leader did three of the sessions as one woman monologues and cringingly self-disclosure sessions! Not the fault of Alpha (who used to say that changing any of the course meant it was no longer Alpha!) but something that makes me cautious regarding Alpha!
For - I've met some great people and seen them come to faith through the relationships and material. It's a great opportunity to form relationships and I can see that for some who came to faith, it was this rather than the material that was the key factor.
Against - I was asked to lead an Alpha course a while back and three quarters of those attending were not only Christians but they had come on their own and one proudly boasted (when I asked the group) that this was her fifth Alpha! The majority knew the material better than the speakers and they were opinionated and a real hindrance to those who had come for the first time as 'nonnies' (I really hate that term - gets the righteous anger going - not that I needed it with this Alpha groupie group!

).
Bottom line - I'm about to embark upon another one. A proper Alpha with all the required units and covering all the points that make it Alpha. We'll have an away day rather than weekend and I'll be blessed. let's hope those who come will be!
Vic