I just recently bought an altijd voordeel abbonnement because I travel on the train before 6:30am in the morning and wanted to save a bit of money on the costs of my travel. The NS advertises that I will get 40% discount in the 'daluren' and 20% discount in peak travel times.
What I normally pay in the morning (without discount) is €6,70 (Dieren to Nijmegen Heyendaal) and €0.53 (Nijmegen to Nijmegen Heyendaal; so no instaptarief). In total this is €7,23. In the evenings in the opposite direction I pay €1,95 (Nijmegen H to Nijmegen) and €5,00 from Nijmegen to Dieren (total of €6,9). In total for the day this is €14,18. For the 22 days in November/December that I will travel this will be € 311,96.
With the altijd voordeel abonnement, I now pay €4,00 for Dieren to Nijmegen and €1,56 from Nijmegen to Nijmegen Heyendaal. So I pay nearly 3 times as much for the second rit because I have to pay the instaptarief again but still have a saving of €1,67. However, in the evenings I now pay €1,56 (still a discount) from Nijmegen Heyendaal to Nijmegen and €5,40 from Niijmegen to Dieren (now €0.40 more expensive for a total of €6.96) which is €0.01 more expensive than I pay without altijd voordeel card (so definitely not 'altijd voordeel')
So for 22 days with discount I pay €275, 44. Without discount I pay €311.96 and so my total discount is €36,52 per month (11.7%). When you take into account that I also pay €25 for the privilege of getting this discount, then my total discount is reduced to €11,52, the equivalent of a whopping big 3.7% discount for the month (so not even close to the 20% I should get if I was only to travel in the peak hour. Also don't forget, that for each day I don't travel (so if I'm sick or take a day off, or go in the car), then my discount goes down. Moreover, there is nothing in the conditions of the contract stating that the instap tarief has to be paid for each rit.I find this to be totally false advertising and I'm very concerned about the integrity of NS as a business. In the future, I will certainly not be travelling with the NS unless I have no other alternative or my work pays for it.