I bought the BX (in addition to my other Citroen, a ZX) as a hobby car and because I have always wanted one.
I think the BX is a very underrated motor car being comfortable, quick, economical, more reliable than people think, pretty rust resistant and suprisingly durable. I also think the BX is attractively styled and is aging remarkably well... launched in 1982 in France so 23 years old this year. Indeed its stylist is responsible for Lamborghini Countach, Diablo etc.
Ironically for a car today some rate as 'The last REAL Citroen', by which they mean technologically advanced, forward thinking, aerodynamically efficient and distinctive, was seen as anything, but at launched having been quite heavily influenced by Citroen's new masters/partners Peugeot having a floor-plan shared with Peugeot's yet to be unveiled 405, a compromised version of the famed 'hydro-pneumatic' suspension system utilizing struts at the front as opposed to the wishbone arrangement found on the DS, SM, GS and CX. This meant that even though the BX gave a very comfortable ride it was never the 'Magic Carpet' of the earlier vehicles. High pressure brakes were retained, but power steering, when unveiled was a conventional system as opposed to the 'Vari-Power' system of earlier Cits. Indeed Peugeot was planning to dump Hydro-pneumatics entirely for the BX, but relented when faced with opposition from Citroen staff and dealers. Unlike its predecessor, the GSA, BX had conventional Peugeot sourced water cooled engines as opposed to air cooled. Also despite being pretty aerodynamically efficient it was not as efficient as its predecessor, GSA.
But the BX did pioneer the use of composite materials in cars, being light weight and rust resistant.
For some the BX is a compromised Peugeot/Citroen hybrid for others it was the perfect balance of Citroen virtues without too many 'frighting' quirks. That's why it was Citroen's first very successful model in the UK and one of the best selling diesel cars here ever.
The BX is a comfortable car, having great seats, plenty of space and light and is attractively styled internally for an '80's car.
The suspension does give a remarkably absorbent, floaty ride, but doesn't quite provided that legendary 'Magic Carpet' sensation of the earlier classics, being marginally smoother than my steel sprung ZX, however if you need self leveling this system is relatively simple. Also height adjustment is a real advantage for wheel changing and flooded roads/mild off-roading.
The BX handles fairly tidily, corners quite well and is pleasing to drive in an uninvolved kind of way.
The performance of my 1.4 carb model is surprisingly sprightly, refined for its age and economical, but my choice would be a Turbo Diesel for perfect economy/performance trade off. The BX's light weight is responsible for the decent performace/economy and is both the car's outstanding feature/Achilles heal at the same time; while the Composite construction provides genuinely creditable performance and economy and impressive rust resistance it also makes the car feel somewhat flimsy and insubstantial and leads to poor crash protection, occasionally dodgy handling and its all to easy to lock the high pressure brakes.
In summing up this model I'd say it was a flawed gem; comfortable, economical, quick and stylish on the one hand flimsy, insubstantial on the other. I feel that the BX is a future classic for sure and pleasing day to day transport... if cared for.