It is and it isn't. :)
The camaraderie, the support, the strength of family bonds in the travelling amusement occupations are fantastic, better than anywhere I've ever seen before. When the weather's good, it's not a bad life - though remember, what looks like fun in the sunshine can be very "same shit, different day" for the Showmen!
You build up good working relationships with the EH officials and are often respected for doing a sound, safe job and keeping sites clean etc - but it's a nightmare if you have to deal with a council official with a chip on his shoulder.
Being in a different place every few days has its appeals too. For the men in particular being a Showman has a bit of pulling power.
(But you can bring them back down to earth by saying that they're part time romeos and second class film stars!).
Downsides? How long have you got?
It's financially insecure and seasonal. The weather can screw up ever hope of a good return. The weather can just really piss you off in fact. The public very often mistake Showmen for travellers and adopt a "lock up your daughters & family silver, the gypsies are in town!" approach when Showmen are neither and don't deserve that reputation.
Education for the kids is sometimes varied - some home ed, which is fine and generally involves a lot of help from all the family, some even educate their kids in one school in the summer (where the family's bricks and mortar home is) and another in the winter (where the family own a fixed, seaside fair). That's less common now mind.
Winter is a financial write off and spent getting re-paints done, sorting insurances, buying and selling rides etc - oh, and going on holiday, because you can't really do that in the summer. You have to be very careful to be seen to be doing the right thing - you're a member of the Guild and have to live up to their expectations.
And drunken teens who want to take on the world, tsk! Then they leave all their rubbish and it's the Showmen who have to clear up after them!
But for all the good and all the bad, for many Showmen it's just life. It''s what they were born into and what they were raised amongst, a trade they learned from their parents' knees and knew one day they'd take over, never questioning that fact.