Bike stands are very handy for:
Cleaning & lubing the chain
Adjusting the chain
Cleaning the bike & rims
Changing the oil and filter
Working on the bike
Storing the bike for winter or over 30 days
The best stands are Pitbull and I think the forward rear handle stand works the best as its saves a ton of room when trying to get the bike out of the way.
Never use a front stand without first placing the bike on a rear stand or the bike will tip over.
There are cheaper stands that sell for $100.00 for the set and work just as good as $300+ Pitbull stands if you don't have the cash to blow.