Poor choice. Would not recommend. Almost all the references are going over my head, and I really don't feel like chasing them down. Maybe I'll pick it back up after studying the 1905 revolution or if I really get into German social democrat history or whatever. I'll finish it I guess, but I expect to retain nothing and learn very little.
That was my experience as well. Still going to try Imperialism and State And Revolution.
The State and Revolution is really good. It's a much more interesting read.
Check out Rosa Luxemburg's Imperialism too, it offers a very different, but still compelling, critique from Lenin's (who was also cribbing Hilferding). It's like the most interesting thing she wrote that's not read often.