The only downside we know of is that the payment pages are in a standard theme, i.e. the payment pages will not reflect the same theme as you are using within your site, that is unless Actinic have changed this in the last couple of months...
Just to clarify, the payment pages do not carry across any image elements to the Shared SSL payment page - but you will have the same colours on that page as on the rest of you site.
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