mike3dr,
Which Leshiy are you referring to? The Leshiy Classic (Single Shot) or the Leshiy 2 (Semi-Auto)? If it's the Leshiy 2, it will probably be a while before you can pick up one. Most, including myself, are waiting for their pre-orders that were placed back in April. You'll probably have to get on another pre-order list to get one or wait until they are readily available from EDgun West. Again, like a lot of people are saying here is that they are two different platforms of airguns. I don't have any experience with the Impact and don't plan on picking up one any time soon.
If you like to tinker and have the time, patience and a lot of pellets to tune, then I say get the Impact. I'm not saying that you can't shoot the Impact straight out of the box but when all the adjustment knobs are available at your finger tips, you'll be tempted to mess with it and it can overwhelm you. I can't comment on the Leshiy 2 until I get it in my hands but in my experience owning a couple EDguns, I'm pretty confident that I'll be happy and satisfied.