I looked at the cost (was about $108) vs a stand alone res ~$50-55 and pump top ~$40 (Canadian selection & prices aren't the greatest), it didn't work out to a huge difference (like $20). For that extra bit I got one hell of a solid piece of work, no hassle of where to mount the pump and separate res, lower number of compression fittings (2) as well. The only complaint I have as others, is the bleeding, but again I looked at that as pretty much a once of year, or twice a year issue.