It fits well, not too tight or loose and the screen protector fitted well although I should have paid more attention to avoiding screen dust so messed up there! The button covers are very good and have an almost "snap" to them which I like.
The cut outs are very accurate and the headphone cutout is quite wide to accommodate bulky cables. I use my little fingernail or corner of my other nails to raise the dust cap. If you don't have nails it will be difficult to raise,
I think it will protect the phone if dropped but the case, to my eyes, definitely adds bulk all round compared perhaps, to some others, one of which I also have (http://www.amazon.co.uk/dp/B00OURBFGC/ref=cm_cr_ryp_prd_ttl_sol_0 ) and, also, due to the shape and design of the case, makes the S5 look oddly square and feel physically wider. The bezel surrounding the phone screen, looking top down, I measured at 4mm which gives the impression of further bulk when contrasting with the black screen colour.
Additionally, the colour is not completely "clear", it takes on a strange, opaque, yellowish, brownish colour at different angles and makes the case look old or sun damaged. This does not occur with the other case that I have.
I shall keep and use the case but overall I probably would not have ordered it had I known about the colour or the bulk.