I have been working for DELL, for a good number of years. I no longer work there and am more than glad I got out.
Management is a clique. If one doesn't like you, you'd better get out. Once this happens, you can forget about advancement, rewards, awards and/or pay-rises. There are ways to prevent those, like PIP (Personal Improvement Plans). One of the managers is quite affectionately called 'the PIP-Queen'. Management can be quite cold. One of my colleagues had a bereavement, but had to stay on the phone, because statistics are apparently more important than being compassionate.
The atmosphere on most desks is fairly tense at the moment and in my opinion, doesn't represent a 'Best Place to Work' accolade at all. There are many rumours about redundancies and the signs are there (like minimal investment in people and (office) hardware).
Direct colleagues are fine though and I have never had issues on that front. The same with customers. The one thing I really had to get used to, coming from a consumer desk, was how happy customers are with DELL products.
If it wasn't for management, I would have happily kept working there.
At the moment, there is not a lot, apart from direct colleagues