vw fitted these 'WEBASTO' type sunroofs on the polo & lupo 'open air' models i've not heard or read any bad reports about them i can understand fears about security issues and also water leakage especially on roofs that have had a lot of use i.e. open/close operation, also it depends how long ago the roof was fitted these things do tend to 'ballon' when the car is driven at high speed which can also contribute towards it leaking water and give excessive wind noise,so check the seats for water staining and the carpets for dampness, if the roof was an after market fittment as i expect it is i dont expect that extra stiffening was fitted to compensate for the large roof area that was cut away so you may feel some scuttle shake when driven over bumpy surfaces, On the positive side when they are open it gives you far more open air drving feeling than the traditional glass type and in my opinion looks more 'sporty' but when closed well..........wyn