In some cases it just might not be possible to deliver each visitor the same experience, specially when they are using outdated browser versions (think Internet Explorer 6). If no reasonable solutions lies within your timeframe or budget, the least you can do is warn those users and advice them to update to a newer version.
By including the Browser Compatible Widget into your website you give users the possibility to update before they proceed to your enriched content. And that's all it does, no tracking, no third-party ads, no spam. If you are not sure what to expect just hit the preview button.