Forum Moderators: not2easy
It probably depends on what country you live in, but if it's the one known to be the most litigious nation on Earth, who knows what's possible? That said, it's hard to believe that even there anyone would have a case to be made for just having a link, when that's the main underpinning of the internet. If your online review is libelous, it's a different thing - by you having put it online, you're publishing it, and it's the same thing as putting up posters on hydro poles, or distributing articles to newspapers.
So, if you don't think it's grounds for a libel suit, tell them to get stuffed, discretely.
(Imho, etc)
I don't know the details of your situation, and please don't take this as advice, but if it were me and I thought I was within my rights to give a (non libelous) strong opinion on a company, I would. If they didn't like it and sent me a C&D just to be heavy handed and shut me up, I'd publicize their tactics.
Anyway, that's just me being the way I am because I've been threatened in the past (and won, after a lot of expense and headaches), but you have 2 choices really...
1. Pull the review and link and fuggedaboudit, or
2. Fight with them and the court system.
If you go for #2, be sure you have a bankroll and lots of time and energy to waste. And stock up on antacid tablets too ;-)
As for the linking thing it just seems silly and bad PR for the company. I also own a review site and we write bunches of reviews that put products in unfavourable positions and we haven't recieved something this silly yet. Tell them to make a better product and remove the link if it doesn't suit them.
Removing the link and leaving the content would be one approach. Be sure you are acknowledging any trademarks properly. If your review is honest and properly researched, they have little legal ground to complain. That doesn't mean they can't sue you, of course.
Yet another option would be to offer them the opportunity to post a response on your site. Free content for you, and the tacit acknowledgement that your site is important. Win-win.