We use wkhtmltopdf its fine for document generator. Code int our PDF template.

@using Umbraco.Web
@{
    Layout = null;
string PDF_CONVERTER = Server.MapPath("/App_data/wkhtmltopdf/wkhtmltopdf.exe");

var filename = Model.Content.UrlName + ".pdf";
var path = Server.MapPath("/App_Data/wkhtmltopdf/pdfs/" + filename);
var url = Request.Url.Scheme + "://" + Request.Url.Host + Model.Content.Url;
// Create directory if needed
var di = new DirectoryInfo(Path.GetDirectoryName(path));
if (!di.Exists){ di.Create(); }

// Connect to process
var process = new System.Diagnostics.Process();
process.StartInfo.FileName = PDF_CONVERTER;
process.StartInfo.Arguments = string.Format("-T 7 -R 0 -B 40 -L 0 --page-width 1024px --dpi 600 --footer-html {2} --header-html {3} --page-width 992 --zoom 0.7 --no-stop-slow-scripts --disable-smart-shrinking cover {4} {0} {1}",
    url,
    path,
    Model.Content.Children.LastOrDefault(c=>c.DocumentTypeAlias == "DocumentHeaderFooter").UrlWithDomain(),
    Model.Content.Children.FirstOrDefault(c => c.DocumentTypeAlias == "DocumentHeaderFooter").UrlWithDomain(),
    Model.Content.Children.FirstOrDefault(c => c.DocumentTypeAlias == "DocumentCover").UrlWithDomain());
process.Start();
process.WaitForExit();

Response.Clear();
Response.AddHeader("content-disposition", "attachment; filename=" + filename);
Response.ContentType = "application/pdf";
Response.WriteFile(path);
Response.Flush();
Response.End();
}