yes, but it's nowhere near as portable a solution, plus it means you've got mains trailing about outside, etcetc... also, it's not a bargain from TFC, buy it direct from the phillipines from tronix
I have an XT and whilst it's not as portable as a Quadra, it's certainly a considerably portable option.
XT's also can power much more powerful heads or two (and possibly more) mid range heads (400 to 600ws) for many more pops. So if a compromise on a few extra kilos in weight for much more power and duration is more of a priority, it's a valuable option to consider.
I've had two colleagues buy direct from the Philippines and I wouldn't advise it, if there are any warranty repairs needed you'll be paying a sizeable amount to ship 8 kilo's worth back to them with the insurance on top.
£395 for the new SE XT isn't a bad price at all considering your paperwork is all with the Flash Centre. Germany was a good alternative but expect to pay 470€ for the SE. The Flash Centres price is good.
As for cable safety, there are cables with any head and pack option, be it Profoto, Hensel, Lencarta or Elinchrom, it still needs to be considered.
The plus side to having your standard mains cable as opposed to the type typical to head and pack options, is that extensions won't cost you anywhere near as much.
You do indeed have to buy good quality mains cables but it's nothing in comparison to the price of an Elinchrom Quadra 1 mtr extension for example.
Obscene is an understatement.
To the OP,
A Quadra set for studio work alone would be huge waste of cash IMO.
There's only a few reasons why folk part with the best part of 1.5K for a 400ws system, size/weight of a dinky pack being right at the top of list and output capability and usage duration right at the bottom.
I've used one an awful lot, Quadra has it's uses but it's far too limited for that kind of price tag for me personally and Elinchrom accessory prices I find comical.
Horses for courses of course however and each to their own.
If your going to be predominantly based indoors then AC powered heads are most likely your best bet.
If you do fancy some outdoor excursions, the XT's are a great option for you to take those AC heads with you and provided you respect the maintenance of the SLA battery, you'll get a huge amount of use out of one charge.
With two Elinchrom FX400's heads connected, I lost count after 500+ pops on full power and the battery light remained on green.