To answer your questions
Any issues with this model?
Paintwork and finish are god awful, Mine never locked back on empty, mags are crap and leak to easily
How gas efficient is it?
Google WE 1911 gas efficiency. The first page alone should be enough to answer your question
what is the kick like?
Like any other Gbb only you wont have enough gas in a single stack mag to shoot it more than 6 times (others may have gotten more, mine didnt)