My Bristol subscription ran out last week so I took the plunge and signed up for this last night, and it is spot on so far. The fact that the question bank is divided up into subject areas is great and is something that I always thought was lacking with Bristol.
U can also put any problem questions on a clipboard and save them to retake later, which saves from copying down individual question IDs and putting them into the form like you have to with Bristol, plus Ive not come across any mistakes and repeated questions yet, of which Bristol has many.
As for the numbers of questions:
Pof: 585
agk: 651
Mass and bal: 213
performance: 366
instruments: 541
radio nav: 374
OPs: 410
Flight planning: 534
gen nav: 557
met: 1013
Air law: 532
Hpl: 912
Ifr coms: 118
vfr: comms: 119