I just picked up a DSLogic Plus from eBay in the UK. I made sure I was paying £86 instead of £56. The £56 ones don't have the 256MBit buffer as far as I can tell.
It think it's OK.
Couple of things: Need 100MHz bandwidth to properly sample a 32MHz SPI bus. Need 50MHz to sample 16MHz SPI, otherwise just get garbage.
I think the Basic one, can't do >50MHz with more than 3 channels, because it can only do Stream mode as it has no buffer, however for SPI you could leave off MISO or EN/SS or something depending on what you're doing.
Other thing, and this is something the $999 Saleae can't do. Trigger on serial packet. Again, it needs to be in buffer mode as it's done on the FPGA (so the Basic edition is out), but the DSLogic Plus will trigger on up to 16 bits of serial data, like this:
The DSLogic, despite using a USB type-C connector, is only USB2 though. That may explain the limited bandwidth when not using Buffer mode of the Plus version. So in summary, get the Plus version with buffer. Thanks to a third party contributor, RLE compression has increased the storage capacity of the onboard memory greatly. DSLogic themselves don't seem to have done much work on the kit in the last few years, and you can't even register to their forums without emailing them with your transaction ID to get a code. No wonder it appears dead on there.
I'm quite happy so far I think. It came with the coaxial leads as well, in the separate bundles of 4 each. Again I think the cheaper Basic version doesn't come with those nicer leads. I had to connect up a few more grounds to get a good signal, but then my setup is pretty rough.