They are cheap for a reason ! They are not perfect, clearly you will
not get the same gun for sub £100 that you will get for £300 + +
With some DIY work they can be made into excellent guns - a simple
strip clean polish will make a huge difference to how the gun cocks
and fires.
If you do start to tune these guns be careful as it is possible to
put over the UK limit of 12 ft lbs get a crono.
They can be made into nice guns for free - just some time and effort
- check out the UK Chinese airgun forum for a ton of excellent
information.
I think it depends on what people are looking for in the hobby, for
me it is about understanding how my guns work and improving them, I
spend time in the shed testing things modifying and improving
them, a totally sorted gun is not for me! Unless I have sorted it of
course.
I completely understand if you want to pick up a gun shoot it and
put it away and never work on it - if it goes wrong back to the shop
to get it fixed - if this is you a Chinese gun is probably not the
gun for you.
Some people have no clue what happens when they pull the trigger ...
and have no interest
Personally I like to understand what is happening, and how it
can be improved ! as these guns are cheap it is possible to
have a few so there is always something to shoot, if you have one in
bits !
list of mods in the order of importance what I have done
Strip clean and polish hammer, tube bolt etc.
Remove any filters from valve
Fit silencer
Change bottom tube to give larger pre chamber
Convert to HPA
Fit a good scope
Fit choked BSA barrel
Change stock
Fit bi pod