I really like my Tactic equipment - I have a TTX 650 and TTX 600 as well as about a dozen 624 and 625 Rx's. Solid performance at much more realistic prices than Spektrum.
The 650 manual is well written and covers most of the features and how to set them up. This TX has very extensive programming ability for its modest price. It will do some things that aren't covered in the manual but are explained here:
Product support via phone or email is also very responsive.