Very rewarding after having flown a bit in singles and when you re ready for the next level.
Actually I d say after your PPL first do the night rating and the IMC.
Then as a next step get your twin rating. First time you'll fly her, she'll feel like a beast, but soon you will learn to control her.
You will fly faster and often higher, above the weather, and with sometimes a higher load.
then your sorties will not be to the next country or off to lunch somewhere but you'll fly to the mediteranean or scandinavia or eastwards to the former east block.....
And yes the cost goes up substantially....
I did mine a couple of years ago at Bonus Aviation at Cranfield and it was a fantastic experience.