Going Together - Risks and Rewards
One of my favorite events from our old location was the five founders of Lumenera sharing their lessons learned. Here is the blog post summary from the event: The Buddy System – Lumenera Founders.
If you are looking for some third party advice here are a couple of pro/con bits of advice to consider:
Absolutely, DO NOT, get a co-founder! - YCombinator
The Co-Founder Mythology – Both sides of the table
Going Solo - Pluses and Minuses
On the other hand, leading from the fortress of solitude can have its minuses too; like no one to bounce ideas off when you have a tough decision to make. Having complete autonomy when making decisions seems like a wonderful thing until you have to do it all the time. Advisors and mentors are helpful, but it is not nearly the same as having someone in the trenches with you on a daily basis. Solitude is the big minus as a solo founder.