Toolstation.com is one of the best online shops according to a major new Which? survey - and homebase.co.uk is one of the worst.
The consumer champion conducted its largest ever survey on online shopping experiences, speaking to more than 10,000 members of the public.
They were asked to rate online retailers on factors including price, deliveries, quality, ease of finding products, satisfaction with the product or service and the likelihood of recommending the product or service to someone else.
White-goods retailer ao.com and beauty specialist lizearle.com emerged as the overall joint top online retailers, with a score of 87% each, with customers praising their speed and efficiency.
Toolstation was just behind with an 85% score, beating johnlewis.com with 84% into fourth place.
At the other end of the scale, coming 97th out of 100, was Homebase's website, with a score of just 60%.
Which? editor Richard Headland said: "Online shopping is booming because it can be more convenient, better value and offers a greater choice of products.
"However, there is a big difference between the brands at the top and the bottom of our table, suggesting some sites need to be a lot more switched on to what their customers want."
The survey also revealed that while shoppers buy online for convenience price is the top factor when people decide which website to use, with nearly four in 10 saying this is the most important.
Other online retailers voted top in the survey were, from fifth place down, wiggle.co.uk, the bodyshop.com, allbeauty.com, ebuyer.com, fragrancedirect.co.uk, amazon.co.uk and maccosmetics.co.uk.
The worst retailers were O2.co.uk, mamasandpapas.com, zavvi.com, whsmith.co.uk, lauraashley.com, hm.com, pcworld.co.uk, homebase.co.uk, vodafone.co.uk, evanscycles.com and, at the bottom, ee.co.uk.