I'm going to play devils' advocate and say that I leave my Telrad unloved and unused on the shelf. It's the only astro accessory I've bought, tried and never used again. The ONLY thing I like about the Telrad is the way that some star charts refer to it for positional reference.
Other than that, I find that the closely concentric circles obliterate whatever is behind them, and make it very difficult to see - even with the intensity turned right down to bare minimum.
I also find the bulk of the thing plainly unnecessary, and can't imagine why the damn thing needs to take up so much scope tube real estate. Try mounting one on a smaller scope from time to time - like an ED80 or something.
The dew shields are positively useless AND expensive, and unless you construct a heated element of your own you'll never keep the darn thing dew-free.
I far prefer a red-dot finder - the William Optics one is a great example. A single, unobtrusive red dot that barely glows when turned down doesn't hide any detail at all behind it.
Just my opinion, but we're allowed to have these I've heard
Pic: William Optics red dot finder with home-made dew strip. Works brilliantly.