Apart from cost, why not? Nice peace of mind to get alerted if a tire is going down. Without them the warnings would annoy the hell out of me, too.
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18