I have a van mounted manual Hannay reel (similar to Cox reel) that is now 14 years old and it is very easy to use.
I wonder if a lot of problems people have with manual reels is due to the quality of the hose reels they use. They Hannay is about £400 to buy incl VAT, but well worth it IMO and last years.
Nothing against electric reels, but if you use a top quality manual you are less likely to feel the need to get one.