I've now read through most of the threads about these chargers. I just ordered a Solarforce L2 and I have a very old 6P which I will bore to hold an 18650. I'm totally new to Li-Ions. I've read all the positives and negatives about the WF-139 which I'm planning on ordering from DX. My question: Are any of the other chargers in this price range any better then the WF-139?