Yes a great bargain and will make your Monster feel much better than the standard shock.
Nitron charge £95 (+VAT unfortunately) for a full service where they will replace everything needed to make it like new again or they do a ‘Short’ service for £65 if you prefer but Nitron have excellent customer service so will advise honestly on what’s needed if you’re unsure.
Plus it’s a few quid more if you need a new spring (in either ‘Nitron Turquoise’ or Black) to suit your weight.
Top tip- when you send it in for a service remove the spring whether you’re having a new one or not so you save a few quid on postage.
This was my (at the time) ten year old shock after a service and new spring: