I suppose i'm prejudiced as it was their products which brought me into modelling in the first place...
Airfix is really one of the great modelling 'tragedies' .They were truly the greatest innovators in the history of modelling. Unfortunately a series of events caused them to go bankrupt and now they seem to be somewhat reviving with new products and a revision of some older ones.
$1.99? How can you go wrong? Just remember what to expect. Some of them (judged by today's eyes) are poor representations - others were 30 years ahead of their time and still, with a bit of work and care can be built into stunning models.In Three words -
Go For It! ...Jim