It’s salary sacrifice, so you may lose those pensions payments from your employer based on the amount of salary you sacrifice depending on how your employer sets it up
Plus, what you’re purchasing has to be at RRP.
Payments spread over one year, or maybe two now?
Then you can choose to take ownership at something ridiculous like 22%, or opt for them to keep it and you continue to enjoy the benefits for another year or two and then you pay the 7%.
Personally, I don’t think it’s worth it anymore.
You can buy what you actually want from anywhere you want in the sale, or nearly new, for cheaper overall 
Also affects death in service etc.
However, it is useful to bring you under £50k if you’re claiming child benefit, or reducing the amount of Child Maintenance you pay (if you have kids elsewhere)
Flip side, it also affects mortgage affordability calculations.
Basically, have a good think about it before committing.
11% overall inflation, 4% interest rates by end of next year, 15% food inflation…