All X5s are smooth, classy and luxurious SUVs. It's not quite as practical as the most spacious rivals out there but it's good enough where it counts, and where it really impresses is the quality of its lavish interior and superb infotainment system. Opt for the xDrive45e, and you are buying one of the most impressive plug-in hybrids around, combining many of the best points of the standard X5 with a substantial real-world electric range and low, low company car tax.