Goran, my own major concern, first & foremost, is always with how the instrument sounds!

Of course, it's a bonus if the instrument looks good too, but neither is that the most important factor, cause over the years, I've played a number of old scarred & bashed about Banjos that weren't much to look at, but which sounded great.

Likewise when it comes to weight, I reckon with all the various additional straps you can attach to a Concertina nowadays, weight really should not be an issue.

Give me a big, scarred, old heavy Concertina over a small, light, pretty young instrument every time. There's a lot to be said for an interesting patina.

Just like my women, I guess I like my Concertinas big & cuddly, with plenty to get a hold of! :-)

Cheers
Dick