I cant speak for the pro series.. but the forte series is really sweet SQ wise..
they are my current choice for powering the front stage of my car.. i still havn't heard anything better.. the only amps that im yet to get a good listen of is..
tube driver blue
McIntosh
Audison (Vrx series only)
although.. as good as the u-demensions are.. you have to find somthing that will match and compliment your splits.. the only reason i found the u-dimention series was because im looking at buying focal uptopias for the front.. and focals US demo car used all u-demension amps (the focals sound awesome through u-demension, bostons might not.. ya never know)
supposedly u-demension make a good monoblock amp as well.. but i think there more of a front end stage amp maker than a sub amp maker... hope this helps

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Car: 1995 Mitsubishi FTO GPX
Head Unit : Sony CDX4005
Amps : 2X Kicker IX404 1X Kicker IX202
Front : Kicker RS6 Resolution Splits
Back : To Be Decided
Subs: 2 Dual Voice Coil Soundtream SPL 12'
[Edited 1 time by Boney on 26 September 2002 at 21:08]