Perhaps just dumb luck here, but I've had very good results with them over the past 3-4 years. In one case I ordered the wrong parts and returning them was no problem. I've also returned cores without any problems.

I too had one package arrive without the magnet, but that's a nit in the grand scheme of things. Generally I see parts in 3 days.

I've found you do need to watch shipping costs when multiple locations become involved. In some cases I can order a substitute part and avoid the bump on shipping costs from the second location. Just recently I was ordering thermostat gaskets and found by ordering one that cost 26 cents more I avoided an additional $6.00 shipping charge. Only once or twice have I been able to find an equivalent on eBay for less money.

Kudos to their website; pretty darn easy to use, even for me.