Mandolin now consumes my life.
Beware. If you start you are doomed.
If you play ITM you will find that the G and D Major scales fall so precisely beneath your fingers that you’ll wonder if it is a sign from God. The scale length is very similar to fiddle, i.e. two octaves of scale barely involve any shift in hand position.
In the UK particularly, mandolin can be really cool. People are familiar with guitars, bass, fiddle, squeezeboxes, whistles, flutes - but mandos arouse interest and curiosity.
simple open chords are incredibly easy. two fingers will get you workable versions of G, C, F, Em, Am, D, Bm - all the essential ITM chords - with no real stretching.
On the other hand, if you want to challenge yourself there are chord shape options that will dislocate every bone on your body.
For anyone considering mandolin I recommend checking out YouTube videos of Planxty to see Andy Irvine, and of Sam Bush to see some fun mixtures of bluegrass with reggae, blues and rock.
Personally I have moved from oval hole flatback to f hole archtops because of the greater versatility. Whereas an f hole A or F style mandolin will work great for ITM, folk, blues, jazz and bluegrass, bowlbacks and flatbacks will not work so well for bluegrass, rock, jazz and, IMHO, blues.
Actually, bowlbacks are rarely played except for classical styles.
It is possible to get a playable mandolin without spending a load of cash, but not easy. Trinity College is one badge found on a range of acceptable Korean instruments that work for folk and ITM. For archtops, Eastman and J Bovier mandolins are very popular and of pretty good quality.
Cheap instruments especially need to be set up well to make them properly playable.
Mandolin is a brilliant instrument. Fun, versatile, different and extremely portable.
Addictive as hell. Beware.