I don't personally use an open reel deck for mix-down currently as I have been happy with the results I am obtaining using a stand alone CD recorder deck from Pioneer.
I choose this method because I don't have specific plans of taking my stereo masters to a mastering facility for preparation of a professionally mastered tape, specifically prepared for CD mass production or vinyl stamping.This is one of the key tasks that a mastering facility would perform for you by tweaking levels, eq, compression, track order and track spacing or cross mixing for songs that flow into one another.
Mastering facilities are looking for a 1/2 track open reel stereo tape from you that is running at 15 or 30 ips with no noise reduction and printed at a fairly healthy level where peak signals are around +3 to +8 db on the meters to gain as good a signal to noise ratio as possible without inducing audible distortion.
They also prefer that you don't overly compress your recording to give them something to work with dynamically.
The tape should be prepared with a minute of blank tape at the head of the reel followed by a series of test tones at low, middle and high frequencies so that they can align their deck to yours for azimuth, eq and level, thus assuring no phase issues or gain mis-matching.
Following this regiment, you will deliver a usable stereo master to a mastering facility.
Cheers!