I can't get the link to open on my phone... booo eBay!
But 306s are cute! The needles are a largely defunct size but are available in 2 sizes at about a £1 a needle. The 306,319,320 all use flat cams (400s and forwards use top hat cams).
The cost of the needles makes these a bit prohibitive to use for everything, and it's worth stocking up on needles, because the supply may well dry up.
But the 300s have a good reputation for being tough sewing machines with a quirky Art Deco look.