Costs & verdict
Everyday costs, plus how reliable and safe it is
Costs, insurance groups, MPG and CO2
Looking at brochure prices, the GLB is competitively pitched against its premium seven-seat rival, the Land Rover Discovery Sport, as well as the best large five-seater SUVs, such as the Audi Q5. If you aren't overly bothered about a posh badge, there are more affordable SUVs that can seat seven, such as the Peugeot 5008.
There are benefits to the GLB's premium badge, though, such as slow expected depreciation. This helps its PCP finance deals look quite tempting when compared with those of some non-premium alternatives.
Our preferred engine – the 220d – compares favourably with the Discovery Sport D180 for official fuel economy. We’ve yet to put it through our scientific real-world True MPG test, though. All the engines are RDE2 compliant, which means there's no 4% diesel benefit in kind tax surcharge to inflate company car tax.
Equipment, options and extras
Sport is the entry-level trim but it still has all the basics, including 18in alloy wheels, dual-zone climate control, manmade leather upholstery and heated front seats, plus the infotainment and visibility aids we've covered off already. AMG Line doesn't bring a lot more to the table, other than 19in alloy wheels, privacy glass and a more aggressive bodykit.
Our favourite 220d engine, the bigger infotainment screens and the clever augmented sat nav we mentioned earlier all come with AMG Line Premium trim. That also gets you ambient lighting inside and keyless entry, which, altogether, make up for its additional cost. AMG Line Premium Plus is too pricey, though.
The GLB is too new to have featured in the 2019 What Car? Reliability Survey. Hopefully it’ll be more dependable than the Land Rover Discovery Sport, which was one of the least dependable large SUVs in the survey. As a brand, Mercedes finished in 24th place out of 31; not overly encouraging but still ahead of Land Rover, which came last.
In terms of warranty, you get three years with unlimited mileage, which is pretty much standard for class. For added peace of mind you also get Mercedes roadside assistance when driving in the UK and Europe. If you want the best warranty a seven-seater SUV can offer, the Kia Sorento's lasts for seven years.
Safety and security
The GLB received five stars (out of five) for safety when appraised by Euro NCAP. It's tricky to compare its score with close rivals though, because they were all tested a few years ago when the standards were more lenient. The GLB doesn't have any major issues, though, apart from a higher-than-average risk of adult chest injuries in a side impact.
Useful safety aids, such as automatic emergency braking, lane-keeping assistance and traffic sign recognition, are standard on every GLB. If you want blind spot monitoring, though, you’ll only find it on the top trim level. Each third row seat has an Isofix point for the secure mounting of a child seat, as do the outer two seats on the second row.
All GLBs come with a Thatcham-approved alarm and immobiliser.
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