I emailed the vendor and asked the questions that tybin had questions about and here is the response:
14 Day Warranty on the hardware .
batteries are not user replaceable. They are internal and rechargeable via USB.
Replacement bottles will be available
So i guess Tybin has valid concerns.
That said I may still consider trying one, merely based on price. Maybe a good, economical starter kit for the bottom feeding experience. You are right though, for a solid long term solution I don't believe this is the answer. You would either need two to switch off during charges or have an alternative kit for backup. Which most would have, but still.