I messaged Sienna on here and asked about the smell, Adam came back to me and said:
'The fragrance has changed in the new solution, although we are working hard at the moment to ensure that our next batch is more consistent with our previous fragrance.'
I have 3 1l bottles of the new Q10 solution and i dont like the smell or the lighter guide colour, so if they are changing it back then i do hope they are going to exchange the bottles i have already! thats a lot of money to spend on something i dont like lol