I think that before buying it is worth waiting for the correction at least to the level of 0.3 $. Now it is too expensive and I sincerely believe that the price at 0.9 is completely unreasonable at the moment.
It will never go back to 0.3 level , a lot have changed in this time.
I would say that buy now because ripple needs just one good news story and it will explode.
One of the milestones which one should be aware in this field is Japan -> South Korea decision on whether to adapt ripple on their network .