Unique Product Descriptions Vs. Speedy Launch

[SEOPA]

We are close to launching a new property and are also in the process of writing completely unique product descriptions for every product. This will continue to take a lot of time.

We are debating the following two options:

A. Launch soon with about 10-15% of descriptions being very unique and the rest being standard (mostly manufacture supplied). Then continue to update product content as we complete new fresh descriptions.

B. Wait to launch until everything is unique. This will probably set us back 2 Months.

We of course would like to go live sooner than later, but don't want to jeopardize anything as it pertains to rankings. The fear internally with launching now is that product pages get crawled, but don't make our best 1st impression with the engines. The counter argument is that it doesn't matter much, pages will get crawled again, and the fresh new content will be considered.

Any inputs on this? Is '1st impression' with Google key, or is there no harm in launching and updating. Everything else is very sound -- architecture, on-site optimization, usability/crawlability etc. It's just the matter of the unique vs. generic product page content.

Many thanks!

[SEOPA]

A 3rd option would be to go live soon, but only with products that have the new unique content created. Then add products as the new descriptions are complete.