I used this product to replace an aging chain-drive LiftMaster. Installation was fairly straightforward; it took me about 8 hours total to install (including coffee breaks) and that included some minor adjustments and clean-up (I'm your average Joe - not especially stupid but not an expert in Chamberlain WD822KD garage door openers either). Because I was replacing an existing door opener I was able to re-use the header bracket supports and (eventually....) the control unit support brackets too. As noted by a previous reviewer, if you're installing from scratch, some of the fasteners needed for installing your own header bracket support and the control unit support brackets are not included in the box - you should plan accordingly and install these items first before attempting the opener install process. The provided installation document is lengthy but has very clear instructions and excellent diagrams.
 


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