Want to pick one up but they aren't cheap. Curious if it's worth it, is it reliable, etc?

I just got mine direct from HK using a 25% off discount card I got at the NRA show earlier this year. Haven't tried it yet.

It comes with the red 9mm recoil spring from the older VP9's, not the newer 9/40 non-colored one that is in newer VP9's. Despite the extended length the weight of the slide is the same (more milling inside). Trigger pull is better too, the lump in the middle is reduced and the break is crisper. That should just be normal variation, but it is better than with the stock slide.

And it just looks cool. Sights are great too.

Only negative is it say VP9-L-B on the roll marks which means button mag release. No idea why they made them say that, unless they determined that complete VP9L's (if ever imported and sold) will have the button mag release because it's more desirable for a competition pistol. I like the paddle since it's the same as all of my other HK's.

Does anyone know of a source that actually has these in stock? I've been searching the net for one and cannot find one anywhere in stock.

I got one of the web that were in stock. Omaha Outdoors. Sights are nice and it has the rubber o-ring for the barrel. I had a couple of failures in the first 50 rounds of ball but after that it runs perfect.
Most people who make holsters for the regular VP9 should be able to add the extra inch without issue.
Worth it? Fiber optic sights(adjustable) are nice, a little tighter groups out past 25yds. While regular VP9 can be had cheap, the extra long slide should bring a better re-sale?

Generally accessories don't increase resale value much. If it was to be sold, it would be better on an auction site as a separate piece. Same thing with extra mags.

I have one, got it when it first came out and got a 25% discount as well from Dvor or Optics Planet(don't remember which).
I also had a holster made by Comp-Tac, and by Black Point Tactical.
Don't really notice any change in the trigger pull as above, but the fiber optic front site and adjustable rear, combined with the longer sight radius does make a difference in accuracy. My regular slide on the VP9 is very accurate, the long slide, once sighted in, is improved - difference between a combat shooter & a very adequate competition gun
Its not really a defensive carry weapon, no night sites, and it's a large pistol. I haven't had any failures, and I've run many rounds thru it at one-time, enough to need gloves to hold.

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Does anyone know of a source that actually has these in stock? I've been searching the net for one and cannot find one anywhere in stock.

Top Gun has them if you're still on the hunt.