Comment by kcurtin

I'd say go for it if a.) the core functionality is intact and b.) you set the customer's expectations. I am in a similar situation at my company and we have begun letting customers use our product. My basic feeling is that the more people you can get using the product the better - they will provide you with feedback and help you test how things scale early on. If the only problem is small UI things, it shouldn't matter so long as you manage is expectations correctly.