I've heard of a few guys ordering from Thomman (German site) - not recently, ebay/US is more popular usually.
No customs on guitars - though, you'll be liable for VAT + Customs clearing charge (around 1%). I recall there being some duties on cases (they're regarded as baggage) - though this might have changed - havn't seen anyone moan about that recently.
One thing - check the shipping options and use the one that will pre-clear customs for you (E.g. Aramex Global Shopper) - SAPO can be a hurdle a.t.m clearing incoming goods and having a agent handle that for can make a big difference in timings.