The Manitou Swinger X4 on my 2007 Patriot needs a service. It’s likely to cost £80 or so I suppose. I’m wondering if it’d be worth spending maybe a little more and replacing it? What do you think? I’d like to stick with air rather than coil.

Remember to add in the cost of a mounting kit if you do go down the new shock route (a suspension specialist will [should] include it but mail order ‘bargains’ don’t).
I wasn’t impressed by my Manitou 3 way, even after a service, so replaced it with a fox Rp23, but if you have no issues with yours why replace it unless you’ve cash to burn? (which is fine!)

I don’t know if it’s good or not, I’ve never ridden a 7″ travel bike with anything else 🙂

I do need to spend money unfortunately, so the question is if there is a cheap option that would be better and not much more expensive.

Looks like RP23s go for about £150 ish on ebay.

I’d get the X4 serviced.
I have a Swinger X3 on my Orange 5 with same single pivot suspension. I found this shock to work much better on this bike than any RP23s I’ve tried on it.
I also found an old X4 on a Santa Cruz BLT worked much better than the RP23 that came with it.