Ryan, who invented the Splinter, just said a few posts back that with proper care they'll last forever. To your point about the spare, I just sold a V1 to justify a ZV2 purchase. I considered another custom Z. I still own a pair of V2s and a V1. I'll be curious how the ZV2 compares to the custom Z because my V1 and V2 Splinters are notably more even and less hot spotty than my og Splinter, which I sold to a friend.
So you might try a ZV1 or ZV2 as a spare to compromise on cost.
@Shit Snacks was just bemoaning broken glass issues with his Chinese manufactured Splinters but I think those concerns are overblown. Ryan was explaining that it was a design issue with the first batch and my experience is consistent with that. I think
@Shit Snacks endured multiple breaks and decided to stick with the custom Zs. I went the cheapskate route and have four Chinese Splinters that are all in rotation and working great.
In both cases we're solving the problem of liking the Splinter so much we'd hate to ever be without one. I thought about another custom Z but my blackwood V2s are so great and I thought the cheaper ZV2 would look good on the three cell DNA250C that arrived yesterday.
The finish on my Chinese Splinters is also aging better than my bubinga custom Z, which is looking much closer to unfinished after a year of use.