Just to add an anecdote from the other end of the scale.
I was contracting for many years to a very large blue-chip insurance company. One of the latest new grad intake employees I worked with happened to like his
Microsoft "natural" ergonomic keyboard that he used at home. So he brought it in the office and got on quite happily with his work. Then our project manager spotted it and went into panic mode. She asked him what it was and where did he get it? When he told her that it was his own keyboard from home, she insisted it be disconnected immediately and he can only use work supplied equipment.
So, this guy comes up with a reason for using it - he doesn't want RSI (repetitive strain injury) and an ergonomic keyboard is better than the crappy Compaq keyboard he had been using. Heh, call her bluff. She then insists that if that is the case then the company will buy it's own keyboard, but she will ask the Health & Safety if it is necessary.
Ok, H&S fully endorse the idea of ergonomic keyboards, but this guy can't use his own as it hasn't been PATS tested and hasn't come from the "preferred supplier" distribution channel.
So now the company has to procure a Microsoft natural keyboard as they have been warned they have a potential disaster on their hands (the legal department got involved) as they don't wan't to be sued for RSI complaints from this employee.
Problem is, none of the "preferred suppliers", Dell, Compaq, etc. stocked a Microsoft natural keyboard. So they had great difficulty in obtaining one (this is about 3 months after him bringing in his own keyboard).
Another 3 months later - a brand new MS natural keyboard arrives for this guy. But he can't use it until it has been PATS tested!!!. I kid you not - Elfen Safety insisted on PATS testing as it was not from their trusted preferred suppliers and have to cover their arses!!
We had totally forgotten about it and didn't give a fuck about his keyboard, but those 6 months of bureaucratic back and forth shenanigans must have cost the company £2500 rather than the £25 the original keyboard cost. I made sure not to include this companies shares in my portfolio, that's for sure!
Give me working for a small or medium company any day - lots more (interesting) work means the day goes by quicker, and overtime is enjoyable.