Luxman L505u . . . why not?


I'm getting close to pulling the trigger on one of these--an upgrade from my Rotel receiver. Before I do, I'd like some perspective from the learned A'gon community. First, will it be a significant upgrade from the Rotel? What kind of sonic improvements can I expect? Second, why shouldn't I buy from Audiocubes II? http://www.audiocubes2.com/brand/Luxman/product/Luxman_L-505u_Integrated_Amplifier.html
I know On a Higher Note is the official U.S. distributer, but my budget pushes me towards the less expensive purchase option. Third, regardless of where I purchase it from, it will need a transformer to boost the power to 220. I don't know anything about the possible effects this might have on sound and performance of the component--can anybody speak to this? Is it possible to have the piece modified to accept the U.S. 110 current? I want the piece because it meets my requirements for an integrated: it's at least 100W, it has speaker A/B (I've got speakers in the kitchen and the main living room), it's got a great phono section (I play 50% records, 50% CDs), and it's got a headphone amp. Those are the features I want in an integrated. Any advice, suggestions, dissuasions will be appreciated.

Danny
rosedanny
has anyone heard both the 505u and the 550A (20w class A) ?
is the 550A just as powerful as the 505 U?
I'm thinking of trying the Luxman route with my harbeths.
thanks for the inputs.
I've heard both the 505u and the 550IIa on Harbeths. I went through lots of amps, seperates and integrateds ... I own Hl5s, and I liked the 550a best, for all music... It had to do with the detail and clarity and that illusion of speed with class A. The 550 is more upfront ... and has no problem driving the Hl5s on even deep soul and heavy rock 'n' roll. The 505u is really something, tho. It's down to personal preference. I've heard the 505u amp hold its own against big mono-blocked rogues driving Harbeth 40.1s, which the 550 couldn't handle.
Jabas

Yes, thanks for the reply.
I do plan to use the 550A for the SHL5s which i also have.

Great! Looks like its a good match with the SHL5s.

Noli
Last weekend I heard a Luxman L-507u paired with a D-05 CD player and DSS monitor speakers. it's difficult to judge a set you don't know. But from what I heard the amp is a really nice amp. Maybe a bit upfront but I prefer that over laidback.

Don't think I would trade in my own Symphonic Line la Musica which costs about the same as the Luxman L-507u in Netherlands. But one could do a lot worse the the Luxman intergrated amp I think.