For German made tools, Wiha is easily number one in market for hammers (especially dead blows) but also well known for their insulated line, including bit holders and virtually every category you can think of as well in that line.
But personally where Wiha shines the most is with their precision line of scewdrivers, especially the Phillips line. Their Phillips #000 I've put through several intense tear down of products (Nintendo Wii, telephones, air compressors, etc) I have yet to have even a single issue with the screwdriver and the finish is still very well intact.
Here is a link to Wiha's website though.
http://www.wihatools.com/ I've found two extensive Wiha reviews and I I'll post them as well from Amazon.
The first being for the Dead Blow and I would really recommend reading that first.
http://www.amazon.com/gp/product/B002M8UH2O/?tag=atomicindus08-20
The second being again being from the same user.
http://www.amazon.com/gp/product/B002M8UH2O/?tag=atomicindus08-20
The user I am talking about is named Scotford by the way.
My two cents, I completely agree. I've actually used this Wiha Wiha 80230 1-1/2 Inch by 21 Ounce Dead Blow Hammer with Cushioned Grip in some really tough settings. Such as taking apart a wooden frame totaling about 400 pounds give or take. Taking the screws out was hard enough, but the both sides of the frame was in exceptionally tight.
Five swings of this Wiha though and I was done in five minutes though. The Phillips #000 has helped me a great deal as well as this has allowed to fix several electrical issues with some of my devices and probably has saved me a vast amount of money instead of taking this to a repair shop as well.
A great place to buy Wiha products is through Grainger, Fastenal, Amazon, Amazon Supply, Digi-Key and even Ebay. However the best person to buy Wiha products on Ebay from is strong63, as he is a licensed authorized Wiha Tools distributor. I've bought from him before and in fact he is who I bought my Phillips #000 with.
I can't speak for Knipex though, at least not until I receive my first tool from then soon. I'll be very blunt here as you seem to be new to German made tools (no disrespect here though) don't buy them at Lowes, Graingers or Fastenal. Your paying top dollar for
no reason at all.
Buy Knipex at Amazon or Amazon Supply for instance. I've seen products that were $80+ dollars at Lowes, go for as low as $40-49 dollars at Amazon/Amazon Supply.
You can also get some good deals with Ebay and Craigslist as well. Truthfully though, your playing a bit with fire though with Ebay, as your likely not going to receiving a new tool and there is always that chance your going to be in for some sort of surprise.
I want to give you one more piece of advice though. Not every item that is sold by Wiha is made by Wiha. What that means is it's either made by another company. This is VERY common with their Pro Turn line and tool bags.
Some of these items are made elsewhere besides Germany and some are in rare cases.
Also on one final note, finding some of Wiha's insulated items requires a
great deal of patience and research.
For example, Wiha 38025. I had to call 10 different companies, spend well over 2 hours of research to find this item for a fair price and I finally did with Digi key. Here is the link, so you don't have to shop around like I did.
http://parts.digikey.com/1/parts/994607-tool-magnetc-bit-holdr-1-4-6bit-38025.html
You can find this also on Amazon, but be prepared to pay a little bit more.
http://www.amazon.com/dp/B000T9SKOU/?tag=atomicindus08-20
If you have any questions about Wiha, here is the most direct phone number I've come across. 763-295-6591. Also I highly recommend Grainger for extra detailed information as well.
But in case you can't reach Grainger at whatever number they give you in your area, here is their Grainger Tech Support number that is open 24/7 hours a day I've been told. 888-361-8649. They are a call center, but here is a catch, their technicians only work Monday through Friday.
Hope I was able to help you out with some information.