This week I rented an Ashford Kiwi 2 from my friend Nikol who runs the Harveyville Yarn School. I love this wheel and it is the first double treadle that I have worked with. It's a very nice wheel and it is very relaxing spinning my batts on it. I have never used a spring/sliding (I forgot the technical name) flyer before. In case you get this wheel, squeeze the spring and it will move smoothly along the arms of the flyer. Don't do like I did and have a, this is a terrible design, why doesn't this move, I will never by this wheel, not too smart moment. My son walked over in the middle of my frustration squeezed the spring and moved it along the flyer with ease for me. At least I learned that this wheel did function properly and it is now lovely to spin on.
Something I appreciate about Nikol is that I can test things out before buying. I highly recommend testing first if it is at all possible. Wheels are a personal preference. Every wheel will suit each person differently. I am thinking of giving the Louet S 17 a spin too. But, I have to say that I am loving the double treadle on the Kiwi. It is a very smooth wheel.