The KJW is a solid pistol. Clone or not, its full metal and has reinforced internals. (I owned one.) So long as you maintain it properly it will last you a good long while.
As for the WE, well my opinion on them is still keep away from them. It has improved some, not enough for me to say that WE is a good option.
The whole "its a clone" argument is not even a valid argument anymore. Sure, the TM is a good pistol, you have to baby it a little bit. As Dimitri said, plastic pistol is plastic.
You dont need a pistol that shoots past 150 or 200ft, all you need is one that is accurate to 100ft. Past that you should be using your main. (This is mostly to cover your MED.)
If you do rock a TM, make damn sure you have a good locking and secured holster that fits your gun perfectly. Land on it hard, or drop it once or twice, you will find out pretty quick why I said this. You should ask my G18 all about that...