I upgraded from a mega modded 3.0.7 (might have been 8) to 3.5.0 and had no problems at all. You will need to revert the majority of your templates, and all hacks will need their 3.5.x ports installing instead of the 3.0.x versions. Just make sure that when installing any products you set set 'Allow Overwrite' to 'YES' in case the tables already exist in your database.
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