the f2000 is a great gun, but bear in mind the following:
1. it won't take pmags, or anything wider than a standard "usgi" pattern mag
2. there's a tab on the bottom of the gearbox needs cut off before it'll take regular midcaps
3. the trigger can be a bit finnicky out of the box, might need a bit of fettling to get semi firing right
4. have fun getting a sling mount, i reccommend getting freindly with someone who knows their way round a sewing machine and making some tactical lingerie for it.
5. be prepared for jokes along the lines of "tactical tuna" or "nice speedboat"
6. the scope on the "hunter" version isn't the greatest, my advice is get the railed version and put an eotech on it
7. the stock hop unit is pretty decent, which is good because it's a custom design so you can't just drop in a replacement
8. bb's will end up inside it, they will rattle, it will annoy you.
9. the front tri rail is crazy money and hard to find
10. the adjustable fps system will back off leaving you wondering why everyone else is massively outranging you
11. the trigger pull is exactly like a black and decker drill- responsive it is not.
12. you will want a mosfet if you're running lipo's because have fun when the semi contact burns out
13. some idiot is going to harp on about it being plastic, despite it only being plastic in the same places the real one is (ie pretty much everywhere)
however, on the plus side:
dissassembly is stupidly easy, 1 pin and the whole front assembly comes off, allowing you to change the barrel/hop rubber with ease, hell you could carry a whole seperate top end and swap it out in the field for a dmr/cqb loadout.
the same can be said for the gearbox, 2 screws and a bit of wiggling to remove it, external trigger contacts, removable mainspring and removable motor cage make it a dream to work on
the internals are pretty good, it took several months of 11.1v carnage to strip the piston and replacing it was not exactly a chore
it looks cool as hell (subjective) and at least you'll stand out
it's a pretty good shooter, balance is a bit odd at first until you realise you can hold it like a giant pistol.
it can take an ak length barrel inside a gun a good foot shorter than said ak
personally i'd call it a marmite gun, if you're not sure on it you'll probably end up hating it, but if you love it you always will.
tbh, given you have a couple of modern guns why not look at going old school? like an m14 or an svd, set it up as a dmr and you won't need as many mags to carry around.