We moved from Surrey to Bavaria in Southern Germany in 2007. We had a young toddler when we moved, and have since had 2 more DC.
We have a better standard of living here - but as others have said it depends what you want. For me it was an active advantage that it is normal, natural and easy to be a SAHM here, whereas in Surrey we needed 2 incomes to pay the mortgage. We have a bigger house here for less money, and the children have a thousand times more freedom, as somebody else said it is like going back in time several decades - it is absolutely the norm for children from age 5 or so to play out, walk to school etc. here and by contrast I find children of my acquaintance in the UK a weird combination of precocious yet immature, often unable to sort out there own disputes with peers and lacking self care and independence skills that are normal and natural in comparable children here. My children have (touch wood) not had any negative experiences of school and Kindergarten here - but then the eldest was only 19 months when we moved and the other 2 were born here, so by the time they started Kindergarten and school they were indistinguishable from any other children. My kids are local kids with an English mum, which is different I guess than being "foreign" kids.
There are loads of potential negatives here - I like that kids don't generally leave their mum til they are 3, and then only for morning Kindergarten, and I am happy with half day school - the children start 2 years later here but within a year they are at the same stage as UK peers, so I can't actually see any advantage to full day school from age 4, aside from the childcare element! However if both parents want work before your children are old enough to be left alone sometimes, and don't want to or can't hire a nanny or an au-pair then this would be the opposite of a better standard of living, clearly!
The kids becoming bi-lingual is in itself an absolutely huge positive reason for moving, IMO but requires a long term stay in one country - as others have said, children do not pick up a language from scratch in 6 months - some in fact struggle for years, especially if they are in an English bubble at home and don't play a significant amount with local friends outside of Kindergarten and school. Apparently if you remove children from significant exposure to a language they have acquired before the age of 10 they are also likely to almost totally lose the language.
For us so far the kids have benefited, though who knows if this will remain the case as school can be very unforgiving and inflexible as I understand it... You certainly don't get much in the way of differentiation and it is very one size fits all, until academic selection occurs going into year 5.
I am sometimes happy here and sometimes totally miserable. We live in the country and I sometimes feel very isolated, partly but not entirely because my German is functional but not great - I can chat within my comfort zone but find it hard to build genuine friendships, partly because I often can't just say what I want to off the top of my head but it is also cultural as well as linguistic.
I am a little sceptical about travelling "for an adventure" unless either the kids are very young - under 5 I'd say, or the adventure is short - a maximum of a year as a one off, and the children can understand that. Otherwise I struggle to understand why people think a transient lifestyle with only nuclear family as constants, and the awareness that any friendship or "home" will soon be a thing of the past, is in the best interests of children.