Well, I received the Blazzeo Swift 250.
It arrived to my place in Slovenia EU 12 calendar days after payment. It would have done it in 2 or 3 days less, had the seller included the invoice to the package. As they didn't, Customs first sent me a registered letter requesting the invoice, which I emailed them.
Contrary to the data from the seller's site, the included specs state it's a 200Ws strobe (with the caption that these values are measured at 220V). Anyway, powered from our 230V mains, the strobe delivers about 2/3 f-stop more light through my brolly-box as compared to the 580EXII set to 24mm zoom. The true recharge time is about 1sec at full power.
The strobe looks and feels pretty well made, with one exception that I'll mention further down. The main section of the body and the reflector shell are metal, the rest is plastic, but nice and sturdy. That goes for the stand/umbrella mount as well.
A spare modelling bulb and spare fuse were included. The mains cable lenght is 5m. The front flange diameter is 95mm.
Even on this new Blazzeo model the modelling bulb still protrudes. I took it off for now, as I have to chimp due to the speedlites anyway.
A nice feature is the "PREF" optical slave mode, in which the ETTL preflash is ignored. The Swift syncs correctly from either a speedlite set to ETTL or the onboard flash, though not from speedlites connected over the master/slave wireless. There's just too much preflashing in wireless, I presume. The "NOR" slave mode requires the speedlites to be in manual, of course.
A word of caution with regard to triggering. I metered a 7.6V triggering voltage, the nominal value (from a seller's response) being 12V, while the safe voltage for EOS cameras seems to be 5V. I have V2s radio triggers as an alternative to the optical slave.
On my copy, the clear dome over the slave sensor had been replaced by a red plastic cap. What bothers me is the fact that they used a cheap press-fit control lamp housing as a makeshift, with the small retaining ribs visible above the surface. Shabby indeed, though an aesthetic issue only - but it somehow spoils the overall impression. Perhaps it wouldn't if I didn't recognize where that cap was coming from. 
This is the first and only strobe that I've handled, so I can't compare, but if it lasts, I think the Swift is well worth the price for amateur use. Complementing my two speedlites, I believe it will broaden my lighting horizon.