Nothing against your products but in answer to your question, I'd recommend building your own still after deciding if you want to build a pot or column still. There are a lot of easy designs out there. For something like vodka I'd recommend a vapour management still, not a Coolant management still that the brew shops sell.
I would only recommend the manufactured stills as they have been tested to ensure the right alcohol is being produced at the right temperature www.queenslandhomebrew.com.au