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If you're not buying brand new, keeping it for under 3 years (warranty length) and doing regular long-distance driving, it's not worth the risk. Don't forget that if you switch off the car whilst it is actively regenerating the DPF, then those problems mentioned will occur EVERY TIME. Don't forget that the aftermarket DPF cleaning methods don't always work, sometimes meaning the unit has to be replaced.
People concentrate far too much on the mpg benefit of modern DPF-equipped diesels but not enough on the poor reliability compared to petrols of the same era. if you do mainly short trips from cold, the mpg benefits will be miniscule, but the risk of regular DPF cleaning is high, and the risk of a major issue costing £0000s is also quite reasonable, easily wiping out any mpg gains even for someone doing 10k - 20k miles.
It's a different story if you tow (e.g. a caravan or heavy trailer) regularly, but if I were you, best to go for a petrol engined car (not necessairly a Mazda [and this is coming from a Mazda car onwer of 13 years]) if you don't need (say) an automatic and are doing under 20k miles pa.
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