There are three types of Only Fools: 1981-1989 when it was at its best; 1990-1996 when it turned into a drama-comedy; and all the crap after that. This mostly covers the best stuff- so buy it.
Only fools and horses has drawn in record viewing figures I believe over 24 million in 1996. It is not groundbreaking comedy, that challenges you. It is not my favourite comedy. But what it does it does incredibly well. Most comedy is quite exclusive and only a minority will enjoy it. These are probably the most groundbreaking. OFAH is the opposite, it's appeal is universal, and enjoyed by many.
It's light, entertaining and fun. And this country is just a little bit different because of it.
p.s. OFAH finished in 1996. I on't know that those other episodes were about. They arn't in this set anyway.