I'm very tempted to pull the trigger on some Batch #3, 4-module units .... However I have yet to receive the Batch 1 order, this is why I hesitate.
I can't decide... can anyone maybe help sway me in favour of pulling the trigger on the order??

Im hesitant myself. I think it smells a little fishy that they are only taking bitcoins and no refunds. They come off saying yeah we are supporting bitcoin by only taking bitcoin however, there is no refund. Even if they did promote a refund who are we going to complain to if you don't get anything back. Think about it... a currency that is not accepted as a real currency YET... The better business bureau would probably laugh at us and ask wtf is a bitcoin. Plus if you didn't even get anything from batch 1.... I wouldn't invest .
Another thought to... All the money that they are making from these orders is more capital in their pockets to build more machines for themselves. I wouldn't doubt your Avalon rig has about 2 months of burn in testing on it already. The unit are real for sure but we would all be crazy not to think that these companies such as BFL and Avalon aren't using these for their own potential gains. They will ship a few out here an there to keep people with the mind set that they are shipping which will acquire more orders. Im putting myself in the shoes of these companies...if I had the key to make millions of dollars and be set for life ...why share it ?