Hi mate,
I shoot with a 7Dmk1 and have done for a couple of years now so thought I'd chime in with my perspective. You'll need to bear in mind that I don't shoot video, I just do stills.
In my opinion the 7Dmk1 is a great camera and I do have a lot of love for it, however there are a couple of things that I would change about it if I could. Let's start with the big ones...
Low light performance is a bit of an issue, technology has moved on and it's starting to show so you can expect noise to show if you are shooting at an ISO of 800 or above and nowadays there are sensors out there that way outperform the 7Dmk1. Indeed it's the same sensor that was used in the Rebels and was in all the other Canon DSLRs for years.
Under exposure can introduce noise in your pics even at lower ISOs, so you really need to nail the exposure if you want the best picture quality.
Dynamic range also lags behind with other cameras outperforming the 11.7 EVs the 7Dmk1 can squeeze out.
It doesn't have a minimum shutter speed function. I know this isn't a big deal to most but it would be really useful to me for a lot of situations.
You'll be using CF cards in the 7D which are more expensive than other memory types and you'll pay extra to max out that FOR for burst shooting.
Other than that it's pretty spot on. The 70D uses the same AF system, has a similar dynamic range, slightly (and I do mean slightly) better high ISO performance. DXO mark scores the 70D just 2 points higher overall than the 7Dmk1 making them very close indeed. From what I can see the video features of the 70D slightly edge it if you use them but there really isn't much to pick between them in the tech specs other than the metal body of the 7Dmk1 being a bit more sturdy.
They are both very capable cameras, however I don't see the 70D lasting much longer than the 7D mk1 given how similar the dynamic range and low light performance is.