I've bought several things from Japan and it's been no more hassle than buying mail order in this country except for ParcelFarce. Parcels are usually in the country within 3 or 4 days, then they sit in a pile at the point of entry until someone gets around to determining the duty and rolling a couple of dice to find out how many extra days that PF will use it as a door stop or paperweight.
Import duty for cameras is 4.2% and lenses are 6.7% of value (
source), then VAT is calculated on the total
including the import duty and finally you've got the hostage fee from PF (or other carrier). Basically, the carrier pays Customs the amount due and charges that on to you with their fee for this "service" added on top, despite your never having the opportunity to pay the duty yourself direct to Customs. The carrier has been paid by the original sender to deliver the parcel to your door, the "service" charge is to cover their administrative costs of providing the service, which you can't decline and which was written into law a few years ago after people starting asking why they had to pay it.
All carriers charge a hostage fee, the reason PF annoys me more than the others is that they have two charges - £8.95 if the item was sent for 48-hour delivery or £13.95 if it was sent for 24-hour delivery (prices correct as at the last time I imported anything). I've never been able to find out why there's a difference and no one at my local PF has had any explanation beyond, "that's what it says here". Regardless of how long it's supposed to take, you'll usually have to wait a couple of weeks for them to inform you of the amount due.
So always add on all the charges before deciding whether or not something's worth importing. I've only had a problem with one item, a camera that was described as perfect but where the metal shutter blades were creased (Canon P, it's a common issue which is why I'd confirmed that the blades were good with the seller). I asked for a part-refund and the seller contested it until I uploaded some photos of the shutter blades to ebay in the dispute along with their original confirmation that they were unmarked, at which point the seller immediately withdrew their objection.