I've cast a couple of the Sintrix Jet rods, they're a bit like a dumbed down Zenith. In my hands it felt heavier than the Zenith (and others in the same price point) and somehow felt a little lethargic but I thought it was a fine short range rod. Not a bad rod at all, but not my cup of tea - the Zenith.... ahh well, now I do like that hugely.
The Helios 2 will shortly be discontinued as the new Helios 3 starts to come 'online', I anticipate there will be a slow release of H3 models much as there was with the original Helios and the H2. There may be further reductions on the H2 as the H3 becomes available, but they've sold well and may not be reduced much further in the UK desirable sizes.