The poster who said that this is highly speculative is absolutely right.
First, the financial information in the prospectus says that the company made a pre-tax profit of £222k in 2010, versus a valuation of £27m - which is a price earnings ratio[/url:2terv4ac] of 121. By way of comparison the P/E for ABInbev is 19, Diageo is 15, Fullers is 16, and for Greene King its 8. In fact the P/E ratio is in dot com territory.
Second, the other companies mention are listed companies whereas the Brewdog prospectus specifically states that the company has no intention of listing. Generally, the P/E ratio for private companies is lower than for public companies because they are harder to sell, even in cases where management doesn't own 92% of the company.
Realistically, the only way I can see an investor in this getting any of their money back is if the whole company was sold. In that context I think that its worth considering that ABInvBev paid $39m (£24m) for Goose Island back in March.
So, I wish Brewdog all the best and I will continue to support them by drinking their beers, but I won't be subscribing for these shares and I wouldn't encourage anyone else who would like to see their money again to do so either.