Replacement forks for a Hardrock Sport Disk?

Following a couple of threads I’ve read here, I’m vaguely contemplating some replacement forks for a Hardrock Sport Disk – On-One have a pair of Rock Shox Recon Silver for £110, which seems a conspicuous bargain. My doubts, however, are . . .
Although several people have written that the Suntour forks that I have now are terrible, they’re the only suspension forks I have any experience of, so I’m not so sure I’ll see a difference. Is it likely I will see an improvement?
The originals are 80mm travel. The Recons are 100mm. Is that likely to be an issue?
Should I be hankering after a remote lock-out as well? I don't find the one on the fork crown any problem to use.
Although several people have written that the Suntour forks that I have now are terrible, they’re the only suspension forks I have any experience of, so I’m not so sure I’ll see a difference. Is it likely I will see an improvement?
The originals are 80mm travel. The Recons are 100mm. Is that likely to be an issue?
Should I be hankering after a remote lock-out as well? I don't find the one on the fork crown any problem to use.
Specialized Roubaix Elite 2015
XM-057 rigid 29er
XM-057 rigid 29er
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If you potter about on fireroads then you may not notice any difference, if you're on bumpier trails, riding with any kind of speed then you'll probably be glad of the change.
"As I said last time, it won't happen again."
My preferred places to ride are woodland trails, some of which can be daylight-under-the-wheels bumpy, and a few other trails which have steps in them here and there. Also popping wheelies in the park to entertain my three year old son - this is a mid-life crisis bike, after all - but not much pottering
XM-057 rigid 29er